Clam up and Drying up

Clam up verb - To stop talking.

Drying up and clam up are semantically related In some cases you can use "Drying up" instead a verb "Clam up".

Drying up noun - The process of extracting moisture.

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