/ ˈkɒstəmʌŋgə(r); NAmE ˈkɑːstərm-/ noun
( BrE ) (in the past) a person who sold fruit and vegetables in the street
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WORD ORIGIN
early 16th cent. (denoting an apple seller): from Costard , a variety of cooking apple + -monger referring to a dealer or trader in a specific commodity.