kiss up to
kiss up to (one)
slang To flatter, praise, or agree with one in a sycophantic manner. He's always kissing up to the teacher, so it isn't surprising that no one else in the class likes him. The boss doesn't like it when people kiss up to her like that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
kiss up to someone
Sl. to flatter someone; to curry favor with someone. Edgar is in kissing up to the boss again. Stop kissing up to me.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.