не высовываться(You just sit tight, till I give you the signal. • We'd better sit tight for a few weeks until the police have stopped looking for us.4uzhoj)
воздерживаться от лишних расходов(We would just sit tight and put all we could in the bank, and when we were old, which won't be so very long now, maybe we should be meagrely secure and go to the movies once a week. (“I Like British Columbia”, a 1938 book by Gwen Cash)ART Vancouver)
ничего не предпринимать(We'll sit tight until the old man can give us the lead • Shareholders are advised to sit tight and see how the situation develops.Taras)
отсидеться("The cops will be there by now. I don't know what they will make of it. We just have to sit tight and wait it out." (Raymond Chandler)ART Vancouver)