in on

• Locution prépositive informelle indiquant une implication, une participation ou une connaissance d'un secret, d'un plan ou d'une activité.

A phrasal preposition used informally to indicate involvement, participation, or awareness of something, often implying being included in a plan, secret, or activity.

1. Involved or participatingB2informal

   To be included in a plan, secret, or activity.

   être au courant / participer

   • She was in on the surprise party from the beginning.
   • Are you in on the new project?
   • He let me in on his secret.

2. Aware of a secretB2informal

   To have knowledge of something that is not widely known.

   être au courant d'un secret

   • Only a few people were in on the deal.
   • I wasn't in on the joke until he explained it.
   • They kept me in on the plan the whole time.