gang·mas·ter /ˈɡæŋˌmɑːstə $ -ˌmæstər/ noun [countableC] British EnglishBrE someone who is in charge of a large group of foreign labourers (=people who work outdoors, using their physical strength), especially labourers who do not have official permission to work in Britain 〔尤指在英国非法打工的外国人的〕工头，工长