Definition of mob cap noun from the Oxford Advanced Learner's Dictionary


mob cap

; NAmE
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a light cotton cap covering all the hair, worn by women in the 18th and 19th centuries Word Originmid 18th cent.: mob, variant of obsolete mab ‘slut’. The word mob was first used in the sense ‘prostitute’ (mid to late 17th cent.), later denoting a negligee (mid 17th cent. to mid 18th cent.).
See the Oxford Advanced American Dictionary entry: mob cap