Know which side of one’s bread is buttered

What is Know which side of one’s bread is buttered?

Know which side of one’s bread is buttered definition and meaning on Dictionary terms:
adjective
affecting, implying, or deliberately revealing shrewd knowledge of secret or private information: a knowing glance.
that knows; having knowledge or information; intelligent.
shrewd, sharp, or astute.
conscious; intentional; deliberate.

 

reference: https://www.dictionary.com/browse/know-which-side-of-one-s-bread-is-buttered

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