Definition

1. Adverb (idiomatic phrase):
   • Participating in or having knowledge about (something, typically a secret or plan): The phrase "in on" indicates being involved with or aware of something, especially something not widely known or something requiring participation.

Usage

• The phrase "in on" functions as an idiomatic unit. It is used after a form of the verb "to be" (e.g., is, are, was, were, be) to describe a person's state of involvement or awareness.
• It is typically followed by a noun phrase (e.g., "the plan," "the secret," "the joke").

Examples

• (She helped plan it and knew about it.)
• (Is he involved in making the decision or aware of it?)
• (They did not understand the joke that others shared.)

Advanced Usage

• "To be in on the ground floor": To be involved in a project or enterprise from its very beginning.
  • He invested early and was in on the ground floor of the successful startup.
• "To be in on the act": To become involved in an activity that others are already engaged in, often for shared benefit or fun.
  • Seeing their success, other companies wanted to get in on the act.

Variants and Related Words

• "In" (preposition/adverb): A core component of the phrase, but with many separate meanings (e.g., inside a location, involved in a general field).
• "On" (preposition/adverb): A core component of the phrase, but with many separate meanings (e.g., atop a surface, about a topic, operating).

Synonyms

• Privy to: Having knowledge of (something secret or private).
• Aware of: Having knowledge or perception of a situation or fact.
• Part of: Involved as a member or participant in.

Related Phrases

• "In the know": Informed about something, especially something exclusive or not public knowledge.
  • Only a few people were in the know about the merger.
• "Clued in on": Informed or made aware of (a situation).
  • Make sure the new team members are clued in on the project details.

Notes

• "In on" is an inseparable phrasal preposition. It should not be confused with the individual words "in" and "on" used separately (e.g., "He is in the office on Monday").
• This idiom often implies a sense of inclusion, shared secrecy, or collaborative activity.

Adverb

1. participating in or knowledgeable out
   • was in on the scheme