The term 'ZIP YOUR LIP!' is an idiom that means to be quiet and not say anything. This phrase is often used as a warning to someone who is about to say something they shouldn't. The crossword solutions for this term include HUSH (4 letters), SHUSH (5 letters), SHH (3 letters), SHHH (4 letters), CANIT (5 letters), SHUTUP (6 letters), STOWIT (6 letters), MUMSTHEWORD (11 letters), PUTALIDONIT (11 letters), and SILENCEISGOLDEN (15 letters). All of these solutions are variations of the phrase 'zip your lip!' and have the same meaning.