shut up like a clam

to suddenly stop talking and to refuse to say any more

Usage notes: A clam is a fish with a shell which closes up very quickly if something attacks it.

When I asked him about his trip to Korea, he shut up like a clam.

Name	Pronounced	Usage
Satu	SAH-too	Finnish
Lysandra	-	Ancient Greek
Arthfael	-	Ancient Celtic
Karena	-	English (Rare)
Viktorija	-	Lithuanian, Latvian, Macedonian, Slovene, Croatian, Serbian
Germana	-	Italian, Ancient Roman