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suck up to

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suck up to someone

Sl. to attempt to gain influence with or favor from someone. In school, Richard was always sucking up to the teacher. Don't suck up to me. It won't do any good.

See also: suck, up

suck up to

Behave obsequiously towards, ingratiate oneself with, as in Now that he's the boss they're all sucking up to him, hoping to get big raises. [ Vulgar slang; mid-1800s]

See also: suck, up