present participle of butter one's bread on both sides

(idiomatic) The identified person appears to be benign, mild-mannered, or calm (but with an integral suggestion that, to the contrary, he or she really is untrustworthy, disagreeable, or mean-spirited).

(idiomatic) To be aware of where one's interests lie in a situation.

present participle of know which side one's bread is buttered on

Third-person singular simple present indicative form of know which side one's bread is buttered on

simple past tense of know which side one's bread is buttered on

past participle of know which side one's bread is buttered on

(Southern US, colloquial) An expression of astonishment upon learning something unbelievable (usually positive).