molčáti to be (ali to keep) silent, to keep silence; to say nothing, to remain silent, to hold one's tongue
molči! keep silent!, keep your mouth shut!, hold your tongue!, pogovorno shut up!
molčite o tej stvari! not a word about this (to anyone)!, mum's the word!
molčáti kot grob to be silent as the grave, to be as silent as death, to be as close (ali dumb) as an oyster, pogovorno to clam up
so stvari, o katerih je bolje molčáti there are topics which are best avoided...
a da molčimo o... not to mention...
kdor molči, soglaša silence gives consent
o dobrih novicah ne smemo molčáti good news must not be kept back
govoriti je srebro, molčáti je zlato the less said, the better
molčáti o čem to keep quiet about something