Etymology
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trade-in (n.)

1917, in reference to used cars, from verbal phrase, from trade (v.) + in (adv.).

updated on October 10, 2017

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Definitions of trade-in from WordNet

trade-in (n.)
an item of property that is given in part payment for a new one;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.