Dive

v. (ving) 1 plunge head first into water. 2 a (of an aircraft, person, etc.) plunge steeply downwards. b (of a submarine) submerge; go deeper. 3 (foll. by into) colloq. a put one’s hand into (a pocket, handbag, etc.). b become enthusiastic about (a subject, meal, etc.). 4 move suddenly (dived into a shop). n. 1 act of diving; plunge. 2 steep descent or fall. 3 colloq. disreputable nightclub, bar, etc. [Old English]