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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References in classic literature ?
In the same manner as in Madeira the wings of some of the insects have been enlarged, and the wings of others have been reduced by natural selection aided by use and disuse, so in the case of the cave-rat natural selection seems to have struggled with the loss of light and to have increased the size of the eyes; whereas with all the other inhabitants of the caves, disuse by itself seems to have done its work.
I will not, however, here give any instances, for I see hardly any way of distinguishing between the effects, on the one hand, of a part being largely developed through natural selection and another and adjoining part being reduced by this same process or by disuse, and, on the other hand, the actual withdrawal of nutriment from one part owing to the excess of growth in another and adjoining part.
The local vibration levels, measured by PK Velocity in IN/SEC, were reduced by 75-80% and the noise levels were reduced from ~0.26 to 0.04, a ~85% reduction.
Learning curves are reduced by leveraging an IT group's existing knowledge of IP networks and their understanding of their preferred LAN supplier's products.
* Nylons: Various grades of Cell-Span in injection molded nylon 6, 66, and other nylons have allowed molding temperatures to be reduced by 18[degrees] to 45[degrees]F while reducing cycle times by 20 to 35 sec in both natural and glass-filled systems.
Basis is further reduced by the amount of the shareholder's deduction for depletion for any oil and gas property the S corporation holds, to the extent such deduction does not exceed the proportionate share of the adjusted basis of such property allocated to the shareholder under IP.C section 613A(c)(11)(B).
Our results show that, because of the complex pathogenic process of TB, high-incidence epidemics are unlikely to be substantially reduced by widely deploying highly effective preexposure or postexposure vaccines.
4942 minimum-distribution requirements for all base-period years, which require a minimum annual distribution of 5% of the average FMV of investment assets during the current year (reduced by the tax on investment income).
Each model was reduced by removing the least significant higher-order term first, reevaluating the model, and repeating the process until all effects were either significant at approximately the 5% level of included in a higher-order term that was significant.
31, h in taxable income will he reduced by at least $70,000--the total of his purchases.
Since the free energy is negative in both cases, the silica lining will be reduced by carbon in the molten iron.
The muscles function poorly after stretching because the "stiffness" required for maximal force is reduced by the stretching.
Gregg also points out that according to a study conducted for Falconbridge by an independent group in England, their competitive ability to produce nickel will be reduced by 22 per cent if Kyoto is ratified.
(1) Among monogamous women who had a partner reporting six or more lifetime sexual partners, the odds of having cervical cancer were reduced by about 60% if the partner had been circumcised.
Record retention burdens can be best reduced by increasing the currency of audits; if taxable years are closed in a more timely manner, there will be less need to retain records relating to those years.