know which side of one's bread is buttered

Idioms

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.

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023