trade upon

noun

1. Obsolete
   1. a track; path
   2. a course; regular procedure
2. 1. a means of earning one's living; occupation, work, or line of business
   2. an occupation requiring skill in any of certain kinds of work done with the hands, as distinguished from unskilled work or from a profession or business; craft
   3. all the persons or companies in a particular line of business or work
3. the buying and selling of commodities or the bartering of goods; commerce
4. dealings or the market involving specified commodities, customers, seasons, etc.: the tourist trade, the Easter trade
5. customers; clientele
6. a purchase or sale; deal; bargain
7. an exchange; swap
8. the trade winds

Origin: ME, a track, course of action < MLowG, a track < OS trada, a trace, trail, akin to ME trede, tread

adjective

1. of or relating to trade or commerce
2. of, by, or for those in a particular business or industry: trade papers or journals
3. of the members in the trades, or crafts: trade unions

intransitive verb traded, trading

1. to carry on a trade or business
2. to have business dealings (with someone)
3. to make an exchange (with someone)
4. Informal to be a customer (at a specified store or shop)

transitive verb

1. to exchange; barter; swap
2. to buy and sell (stocks, etc.)