Definition of trade something in in English:

trade something in

Exchange a used article in part payment for another: she traded in her Ford for a Land Rover
More example sentences
  • The British know about these and probably have a deal with them to keep these weapons until they can be traded in for cash in exchange for information.
  • It'd better stay that way, too, because if one should turn up in my stocking I shall trade it in for a waistcoat when we get to London, see if I don't.
  • Some sites run currency exchanges where players can take their platinum pieces and trade them in for real dollars or the game currency of another virtual world.
See parent entry: trade

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Word of the day demoralize
Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope