know which side one's bread is buttered on

know which side one's bread is buttered on  {v. phr.}
To know who can help you and try to please him; know what is for your own gain.
Dick was always polite to the boss; he knew which side his bread was buttered on.
Categories: polite {v. phr.}
Source: A Dictionary of American Idioms
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To section: K

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