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–noun
1.
the act or process of buying, selling, or exchanging commodities, at either wholesale or retail, within a country or between countries: domestic trade; foreign trade.
2.
a purchase or sale; business deal or transaction.
3.
an exchange of items, usually without payment of money.
4.
any occupation pursued as a business or livelihood.
5.
some line of skilled manual or mechanical work; craft: the trade of a carpenter; printer's trade.
6.
people engaged in a particular line of business: a lecture of interest only to the trade.
7.
market: an increase in the tourist trade.
8.
a field of business activity: a magazine for the furniture trade.
9.
the customers of a business establishment.
10.
Informal .trade paper
–verb (used with object)
12.
to buy and sell; barter; traffic in.
13.
to exchange: to trade seats.
–verb (used without object)
14.
to carry on trade.
15.
to traffic (usually fol. by in ): a tyrant who trades in human lives.
16.
to make an exchange.
17.
to make one's purchases; shop; buy.
–adjective
—Verb phrases 18.
of or pertaining to trade or commerce.
19.
used by, serving, or intended for a particular trade: trade journal.
20.
Also, trades. of, composed of, or serving the members of a trade: a trade club.
21.
trade down, to exchange a more valuable or desirable item for a less valuable or desirable one.
22.
trade in, to give (a used article) as payment to be credited toward a purchase: We trade in our car every three years.
23.
trade off, to exchange something for or with another.
24.
trade on 
/ upon, to turn to one's advantage, esp. selfishly or unfairly; exploit: to trade on the weaknesses of others.
/ upon, to turn to one's advantage, esp. selfishly or unfairly; exploit: to trade on the weaknesses of others. 25.
trade up, to exchange a less valuable or desirable item for a more valuable or desirable one.
