know which side of one's bread is buttered
Be aware of where one's best interests lie, as in Jerry always helps out his boss; he knows which side of his bread is buttered. This expression alludes to the more favorable, or buttered, side of bread and has been used metaphorically since the early 1500s.
Words nearby know which side of one's bread is buttered
know one's way around,
know only too well,
know the ropes,
know the score,
know where one stands,
know which side of one's bread is buttered,
know-all,
know-how,
know-it-all,
know-nothing,
know-nothings