When asked about the incident, the suspect began to clam up
She tends to clam up whenever her ex-boyfriend is around
The witness was instructed to clam up and not speak to anyone about the case
He usually talks a lot, but today he's completely clammed up
Don't clam up now; we need to know what happened
During the interrogation, he started to clam up
The child clammed up when his parents asked who broke the vase
Even when faced with direct questions, the politician clammed up
I tried to get her to open up, but she just clammed up
The normally chatty student clammed up when the principal called him to the office
Why did you clam up when I asked about the project?
I did not want to say anything I might regret.
That's understandable, but we need to talk about it.
When asked about the scandal, he decided to clam up
He refused to answer questions about the scandal
He remained silent regarding the scandal