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Definition of Chum up
1. Verb. Become friends; act friendly towards. 
Definition of Chum up
1. Verb. (idiomatic informal) To make friends with someone. ¹
¹ Source: wiktionary.com
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1. Verb. Become friends; act friendly towards. 
1. Verb. (idiomatic informal) To make friends with someone. ¹
¹ Source: wiktionary.com