deal in phrasal verb ( see also ↑ deal )
1 . deal in something to buy and sell a particular type of product ⇨ dealer
deal in shares/securities etc
investors dealing in stocks and shares
deal in drugs/stolen goods etc
He then began dealing in heroin.
deal in antiques/second-hand books etc
2 . deal in something to be interested or involved in something:
As a scientist, I do not deal in speculation.
3 . deal somebody in to include someone in a game of cards