trade in

trade in idiom
Give or sell an old or used item and apply the value or proceeds to a new item. For example, Some people prefer to trade in their old car to the dealer, but we feel we'll do better by simply selling it. [First half of 1900s]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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