clam up

A lot of people just clam up and keep to themselves these days.

And of course that's when he started to clam up.

They were clamming up because he was getting too close.

Either no one knows anything or they are clamming up.

If I asked him questions straight out, he might clam up.

Or maybe you'd just clam up and ask for a lawyer.

But they're both clamming up on some parts of the story.

"What I saw him do was clam up and ask for a lawyer."

I'll find a use for it when some politician clams up.

As the appointment began to seem certain, they clammed up.

Wish I could get him to come out and talk to you guys, but he's clammed up on us.

What made another close colleague clam up about her own recent job loss?

It'll be interesting to see if my sources clam up on this thing.

Some of the good humor fell away, but not enough to make me clam up.

As the questions became more technical, the two men suddenly clammed up.

That decade is here, but the editor has decided to clam up.

Settled into practice a few years later, doctors clam up.

"At other times, it seems it's just too much and he clams up."

Companies will clam up or issue a lot of pap.

Asked for some details, they all laughed and clammed up.

"Try to put them on the air and they'll clam up.

Other times, she would clam up tight, not even acknowledge questions.

When I pressed her for details, she quickly clammed up.

They turned to go into the student rooms, saw me and clammed up completely.

"Well all the more reason for you to clam up about it," he warned.