Chum
/tʃˈʌm/
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Definition
(noun) A friend; a pal.
Sentence Examples
To attract sharks, scientists prepare a special bloody bait concoction known as "chum".
Calling someone a chum simply shows your overestimation of your place in the social hierarchy.
CEFR Practice Quiz
He is an old school ____ of mine whom I haven't seen for many city years.