Definition of suck up phrasal verb from the Oxford Advanced American Dictionary

 

suck up

 phrasal verb
phrasal verb
 
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Phrasal Verbs

suck up (to somebody)

(informal)(disapproving)
 
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to try to please someone in authority by praising them too much, helping them, etc., in order to gain some advantage for yourself
See the Oxford Advanced Learner's Dictionary entry: suck up

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