Definitions

1. adverb

used to indicate being or going inside something, or being in a close or intimate relationship with someone or something

“She was in with the group of artists.”

2. noun

a person or group with whom one is closely associated or affiliated, especially in a social or professional context

“The team is now in with a good chance of winning the championship.”

3. preposition

used to indicate being inside something or being in a close or intimate relationship with someone or something

“The key is in with the lock.”