Related Clues:

• Gets involved, with "in"
• __ for (decides on)
• Declines to join (with "out of")
• __ out (unsubscribes)
• Uses one's discretion
• ___ out (unsubscribes)
• ___ in (chooses to participate)
• Makes a member of, in a way
• Declines to join (with ''out of'')
• Decides not to join (with "out of")