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Definition of Crank up
1. Verb. Start by cranking. "These cars won't crank up "; "Crank up the engine"
2. Verb. Rotate with a crank.
Definition of Crank up
1. Verb. To start something mechanical, an act that often used to involve cranking. ¹
2. Verb. (idiomatic) To increase, as the volume, power or energy of something. ¹
¹ Source: wiktionary.com