After a few probing questions, it was clear the informant was going to clam up.
After the embarrassing incident at the party, she threatened to clam up for the rest of the weekend.
After the scandal broke, the celebrity decided to clam up and avoid the media.
As soon as the boss entered the room, everyone seemed to clam up and stop talking.
Despite being asked about his opinions, he chose to clam up and not weigh in.
Despite my best efforts, he continued to clam up and refuse to share his feelings.
Despite our repeated attempts to coax him, he continued to clam up and remain silent.
Even though she wanted to confess, fear made her clam up and keep the secret to herself.
Faced with such intense scrutiny, it was understandable that she began to clam up.
Facing the daunting task of public speaking, he felt his throat tighten and knew he was about to clam up.
Feeling overwhelmed by the situation, he chose to clam up and observe silently.
He attempted to feign ignorance, hoping that would encourage them to clam up about their suspicions.
He began to clam up as soon as he realized he might accidentally incriminate himself.
He began to clam up as soon as the topic shifted to his personal life.
He began to clam up during the awkward silence.
He can be quite talkative, but ask him about his finances and he'll completely clam up.
He knew he should apologize, but pride made him clam up and refuse to admit he was wrong.
He knew he should speak up, but the fear of repercussions made him clam up.
He knew he was being manipulated, so he decided to clam up and refuse to cooperate.
He often clam up during serious conversations, preferring to avoid deep emotional issues.
He often tried to clam up about his achievements, preferring to let his work speak for itself.
He realized he was saying too much and quickly decided to clam up to avoid further embarrassment.
He started to clam up when he realized he was outnumbered in the argument.
He suddenly began to clam up after receiving a text message, suggesting he was hiding something.
He tends to clam up when discussing topics he doesn't fully understand.
He told himself to clam up before he said something he'd regret.
He tried to be brave, but when confronted with danger, he couldn't help but clam up.
He tried to be supportive, but whenever she discussed her past, she would immediately clam up.
He tried to get her to talk about her problems, but she would always clam up and change the subject.
He wanted to argue, but he knew his boss would only get angrier if he didn't clam up.
He wanted to tell her how he felt, but the fear of rejection made him clam up.
He would clam up during difficult conversations instead of working to improve the relationship.
He would rather clam up than engage in gossip.
He would suddenly clam up in the middle of a phone call, saying that the connection was breaking up.
He'd almost clam up out of some odd sense of chivalry, to protect the information someone else was keeping a secret.
He'd always clam up whenever the topic of his childhood came up.
He'd quickly clam up if he felt someone was judging him.
He's usually very friendly, but if you mention his ex-wife, he'll instantly clam up.
I could see in his eyes that he was about to clam up and shut me out completely.
I could tell she was hiding something because she started to clam up and avoid eye contact.
I knew something was wrong when he began to clam up during our usual late-night talk.
I suspect he knows more than he's letting on because he always seems to clam up when the subject is mentioned.
I tried to get him to talk about his problems at work, but he would just clam up and brush it off.
It's hard to get him to open up; he tends to clam up under pressure.
Knowing he was about to reveal a secret, he quickly decided to clam up and remain silent.
Knowing she was about to cry, she excused herself and went somewhere to clam up and compose herself.
Knowing she was being judged, she began to clam up and second-guess everything she said.
Knowing she was being recorded, she decided to clam up and say nothing further.
Realizing she had revealed too much, she quickly decided to clam up and change the subject.
Seeing the anger in her eyes, he wisely decided to clam up and avoid a fight.
Seeing the police car, the suspect began to clam up and act suspiciously.
She desperately wanted to confide in someone, but fear made her clam up and keep the burden to herself.
She has a tendency to clam up when confronted with criticism, no matter how constructive.
She regretted bringing up the sensitive topic when he started to clam up and withdraw.
She tended to clam up around authority figures, intimidated by their power.
She tended to clam up in large groups, preferring the comfort of one-on-one conversations.
She tends to clam up when she feels overwhelmed by emotions.
She tends to clam up when she feels vulnerable or insecure.
She used to be so outgoing, but after the accident, she began to clam up and isolate herself.
She wanted to defend herself, but the overwhelming evidence made her clam up.
She wanted to share her opinion, but the fear of being ridiculed made her clam up.
She was about to reveal something shocking, but then she saw her friend's warning glance and decided to clam up.
She was so excited to share her news, but her enthusiasm vanished when he started to clam up.
She would frequently clam up during disagreements, resorting to passive-aggressive tactics instead.
She would often clam up about the people she disliked.
She would often clam up during family gatherings, feeling like an outsider.
She'd clam up and stare out the window when confronted with difficult questions.
She'd completely clam up after a long day of work because all her energy had been exhausted.
She'd often clam up during arguments to avoid escalating the conflict further.
She'd try to open up, but old habits die hard, and she'd inevitably clam up.
Sometimes it was better to just clam up than say the wrong thing.
The cat always used to clam up when it was around new people.
The child would always clam up when scolded, retreating into a world of silence.
The child would clam up and bury their face in a book to avoid social interaction.
The child would clam up when meeting new people, hiding behind his mother's leg.
The defendant, on the advice of his lawyer, decided to clam up and remain silent throughout the trial.
The fear of making a mistake often caused her to clam up in meetings.
The intense pressure of the performance caused him to clam up and forget his lines.
The interrogation seemed to be going well until he saw his lawyer signal him to clam up.
The journalist suspected the politician was about to clam up, sensing a sensitive area.
The manager watched as the team member visibly clam up after the difficult feedback.
The moment he got nervous, he started to clam up.
The moment the teacher asked him a direct question, he'd clam up with anxiety.
The nervous applicant started to clam up midway through the job interview.
The only time he seemed to clam up was when asked about his future plans.
The pressure of the deadline made the entire team clam up and focus intently on their work.
The pressure to conform caused him to clam up and suppress his true feelings.
The pressure to succeed often made her clam up and perform below her potential.
The reporter sensed that the interviewee was about to clam up and quickly changed the subject.
The student knew the answer but was so nervous that he started to clam up in front of the class.
The suspect chose to clam up, exercising his right to remain silent.
The team had to deal with the fact that one of the new recruits would consistently clam up whenever a new task was being described.
The therapist tried to get her to talk about her trauma, but she would always clam up.
The threat of legal action caused the company to clam up and issue no further statements.
The witness began to clam up when the questioning became more aggressive and accusatory.
The witness started to clam up as soon as she saw the defendant enter the courtroom.
The witness was cooperative until the defense attorney started questioning her, then she began to clam up.
When faced with the complex problem, he felt his mind go blank and knew he was about to clam up.
Whenever the conversation turned to politics, he'd inevitably clam up and avoid confrontation.
Whenever the detective questioned him about the alibi, he'd invariably clam up.