chum up
phrasal verb
chummed up; chumming up; chums up
British, informal
: to become friendly
—often + to
businessmen chumming up to politicians to get their support
Cite this Entry
“Chum up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chum%20up. Accessed 28 Nov. 2025.
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Merriam-Webster unabridged
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