reduce (something) by (something)(redirected from reduces by)
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.
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.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.