in on(redirected from let someone in on something)
*in on something
1. involved with something, such as an organization or an idea; informed about special plans. (*Typically: be ~; come ~; get ~; let someone ~.) There is a party upstairs, and I want to get in on it. I want to get in on your club's activities. Mary and Jane know a secret, but they won't let me in on it.
2. receiving a share of something. (*Typically: be ~; Come ~; get ~; let someone ~.) I want to get in on the new European business that is supposed to develop. We will all want to get in on the scheme.
in on something
doing something with others I wasn't in on planning the party.Related vocabulary: horn in (on somebody/something)
Usage notes: often used in the form get in on something: Let's go! Don't you want to get in on the fun?
Informed about; participating in: Only one business partner was not in on the illegal scheme.