We found one dictionary that defines the word let someone in on the act:

Miscellaneous (1 matching dictionary)

1. let someone in on the act: Idioms

▸ Words similar to let someone in on the act ▸ Usage examples for let someone in on the act ▸ Idioms related to let someone in on the act ▸ Wikipedia articles (New!) ▸ Words that often appear near let someone in on the act ▸ Rhymes of let someone in on the act ▸ Invented words related to let someone in on the act