reduce (something) by (something)

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reduce (something) by (something)

To make something smaller, weaker, narrower, etc., by some amount, degree, or margin. The government has reduced our budget by nearly 25%. Even reducing the temperature on the thermostat by a few degrees could save you hundreds on your energy bill each month.
See also: by, reduce
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

reduce something by something

to diminish something by a certain amount. I have to reduce your allowance by two dollars per week until you pay me back for the broken window. I will reduce the bill by a few dollars.
See also: by, reduce
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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