chum up to
chum up to (one)
To be friendly with someone Why is Patrick chumming up to me all of a sudden? He's usually so distant.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
chum up to someone
to try or seem to become friendly with someone. Todd chummed up to Martin. I don't want to have to chum up to anyone I don't want to work with.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.