Английский ⇄ Русский +

join in on ударения
общ.	присоединиться к (деятельности • A new search for the Loch Ness Monster has been announced for later this year and the organizers of the endeavor are calling on NASA to join in on the hunt. (coasttocoastam.com) ART Vancouver)
разг.	участвовать (E.g., to join in on the fun Wakeful dormouse)