Definition of suck-up
: a person who is ingratiating or fawning
- a suck-up to the teacher
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First Known Use of suck-up
1970
SUCK-UP Defined for English Language Learners
Definition of suck-up for English Language Learners
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: a person who tries to get the approval of someone in authority by saying and doing helpful and friendly things that are not sincere
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