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let it rip

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let it rip

also let her rip

1. to make a vehicle or machine move very fast He would get up early Sunday mornings, fire up the lawnmower, and let her rip.

Usage notes: the pronoun her is often used to refer to a machine

2. to do something with energy and enthusiasm Hendrix would walk into a recording studio, turn on his amp, and let it rip while the tape recorder rolled.

See also: let, rip

let it rip

Also, let her rip. Go ahead, proceed unchecked. For example, Once you get the tractor started, let it rip. The use of her in the variant comes from a tradition of referring to vehicles as feminine. [Mid-1800s]

See also: let, rip