trade inOur editors are putting together more complete content — check back in about 20 minutestrade in動詞 · 1名詞 · 1trade in — verb動詞1. to give something old as part of the payment for something new1.動詞釋義to give something old as part of the payment for something new例句I traded in my old car for a new one.trade in — noun名詞1 解釋1. the activity of buying and selling goods or services1.名詞釋義the activity of buying and selling goods or services例句International trade has increased this year.