n. & v.
n. 1 a a channel or hollow, esp. one made to guide motion or receive a corresponding ridge. b a spiral track cut in a gramophone record. 2 an established routine or habit, esp. a monotonous one.
v. 1 tr. make a groove or grooves in. 2 intr. sl. a enjoy oneself. b (often foll. by with) make progress; get on well. °Often with ref. to popular music or jazz; now largely disused in general contexts. in the groove sl. 1 doing or performing well. 2 fashionable.
[ ME, = mine-shaft, f. obs. Du. groeve furrow f. Gmc ]