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add to (something)
1. To combine something with something else. The thing being added can be named between "add" and "to." Did I add too much salt to the recipe?
2. To increase something in some way. The power outage simply added to our woes.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
add (something) to something
to increase the intensity or amount of something by giving more (of something) to it. You added too much sugar to my coffee.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To increase the amount or intensity of something: The increase in fuel prices will add to the cost of living in the city. After I broke my arm, I added to my misery by chipping a tooth.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.