frock / fräk/ • n. 1. a woman's or girl's dress.2. a loose outer garment, in particular: ∎ a long gown with flowing sleeves worn by monks, priests, or clergy. ∎ hist. a field laborer's smock. ∎ short for frock coat.3. [in sing.] archaic priestly office: such words as these cost the preacher his frock.• v. [tr.] provide with or dress in a frock: [as adj., in comb.] a black-frocked Englishman. ∎ archaic invest (someone) with priestly office. Compare with defrock.