let off on
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let off on (someone or something)
To decrease the amount of pressure, either physical or figurative, applied to someone or something. Let off on the brakes a bit when you're coming to a red light—you don't want to come to a stop that fast. The Eagles refused to let off on the Patriots' offense for the entirety of the game. You should really let off on Steve for a while—his divorce has been really hard on him.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
let off onInformal
To cause to diminish, as in pressure; ease up on: Let off on the gas so that we do not exceed the speed limit.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.