get one's ass in gear
- (US, idiomatic) To exert effective effort; to get going; to get moving; to start producing.
- He had been sitting there for two hours until the boss showed up and told him to get his ass in gear.
- "Ass" is sometimes used to denote self in idioms and expressions, as in "get your ass up", "get your ass out of here."
to exert effective effort