Clam up

The phrasal verb “clam up” means to become silent or to refuse to speak about something, usually because you are shy or afraid.

Some Excerpts:

From TV shows, movies and novels

The Bold and the Beautiful 

Lesley-Anne Down (Jacqueline ‘Jackie’ Payne Marone ) used the phrasal verb “clam up” while talking to Jack Wagner (Dominick Payne Marone) in the popular TV show “The Bold and the Beautiful” as shown below: 

Tags: Jack Wagner, Lesley-Anne Down, Nick Marone, The Bold & the Beautiful