Clam up and Sit on

Clam up verb - To stop talking.

Sit on and clam up are semantically related in prevent topic. In some cases you can use "Sit on" instead a verb "Clam up", when it comes to topics like silence, keep back, make or be quiet.

Clam up and sit on are semantically related in prevent topic. Sometimes you can use "Clam up" instead a verb "Sit on", if it concerns topics such as silence, keep back, make or be quiet.