in on

• Expresión preposicional usada informalmente para indicar participación, implicación o conocimiento de algo, a menudo sugiriendo estar incluido en un plan, secreto o actividad.

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.

   estar al tanto/enterado de

   • 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.

   estar al tanto de un secreto

   • 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.