deal in

Verb

deal in (third-person singular simple present deals in, present participle dealing in, simple past and past participle dealt in)

1. (transitive) To deal cards to someone entering a game; to enter someone into a game by dealing cards to that person.
2. (transitive) To trade (buy and sell) a named commodity.

   Synonyms:

   merchant

3. (transitive) To accept (something or a piece of information) as a basis for a decision.
4. (transitive) To have an interest in something.
5. (transitive) To give (someone) a share or portion of something; to include (someone) in a plan or scheme.
   • We can deal you in on the robbery.
6. (intransitive) To discard another player's winning tile, causing them to declare a win.
   • When your starting hand is clearly behind, one of the smartest things you can do is start stocking up on potential safe tiles. That way, you're less likely to deal in when the pressure hits.2026, Senba Kurono, 136 Ready-to-Use Mahjong Strategy and Tactics, page 57
7. (broadly, intransitive) To be a winning tile that an opponent declares a win off of.
   • Pushing (oshi) means discarding tiles that might deal in, all for the sake of maximizing your win.2026, Senba Kurono, 136 Ready-to-Use Mahjong Strategy and Tactics, page 73