be in on the act

To be included in an activity.

Name	Pronounced	Usage
Aaren	AR-ən, ER-ən	English (Rare)
Maci	MAY-see	English (Modern)
Aishwarya	-	Indian, Hindi, Marathi, Kannada, Malayalam, Tamil
Erwin	ER-veen (German), ER-win (Dutch), ER-vin (Dutch)	German, Dutch, Ancient Germanic
Emelina	-	Spanish
Cian	KEE-an, KEEN	Irish, Irish Mythology