verb
to behave obsequiously in order to gain favor or advantage
preposition
used to indicate the person or group to whom one is trying to ingratiate oneself
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It is unprofessional to constantly suck up to your boss in hopes of getting a promotion.
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Stop sucking up to the teacher just because you want a better grade.
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She always sucks up to the boss to get what she wants.
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Some people will do anything to suck up to those in power.