counting in

Verb

count in (third-person singular simple present counts in, present participle counting in, simple past and past participle counted in)

1. (idiomatic, transitive) To include (someone) in an activity, etc.
   • You're going to the beach? Count me in!

   Antonyms:

   count out

2. (idiomatic, transitive) To do a countdown before the start of something, especially a musical performance, in which case the countdown is in time with the beats of the music.
   • The drummer will count us in with a "three-two-one".