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English definition of “chum up”

chum up

UK old-fashioned informal phrasal verb with chum     /tʃʌm/ verb (-mm-)
to become friends: She chummed up with some girls from Bristol on holiday.Being, becoming friends and getting to know someone
(Definition of chum up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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a situation in which two people are friends

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