in on

Preposition

 * 1) Part of or privy to; involved in (something private, especially a plan or plot).
 * She was in on the surprise from the beginning.
 * We had to let him in on it after he overheard some of us talking.

Translations

 * Arabic: جُزْءً مِن
 * Egyptian Arabic: جزء من
 * Chinese:
 * Mandarin: （私下）知情
 * Norwegian: med på (part of), gjøre kjent med (privy to)
 * Spanish: parte de