part exchange
noun/ˌpɑːt ɪksˈtʃeɪndʒ/
/ˌpɑːrt ɪksˈtʃeɪndʒ/
[uncountable] (British English)- a way of buying something, such as a car, in which you give your old one as part of the payment for a more expensive one
- in part exchange We'll take your old car in part exchange.
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part exchange