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rev

Pronunciation: (rev), [key]
—n., v., revved, rev•ving. Informal.

—n.
a revolution (in an engine or the like).

—v.t.
to accelerate sharply the speed of (an engine or the like) (often fol. by up).

—v.i.
1. (of an engine) to accelerate; become revved (often fol. by up).
2. rev up,to increase in strength or accelerate sharply: The economy is beginning to rev up.