1. put a sock in it - Verb
2. put a sock in it - Phrase
put a sock in it (third-person singular simple present puts a sock in it, present participle putting a sock in it, simple past and past participle put a sock in it)
(figuratively, informal, humorous, idiomatic) To stop talking; to be quiet; to shut one's mouth.
He went on and on until I finally told him to put a sock in it.