boomerang /booˈmə-rang/

1. A curved missile used by the Australian Aborigines, sometimes so balanced that it returns towards the thrower
2. An act that recoils upon the agent

To recoil in such a way, backfire

• one's other half
• one's own
• one's own flesh and blood
• one's own man
• one's own woman
• one's self
• one-step
• one-stepped
• one-stepping
• one-steps
• one-stop
• one's true colours
• one-time
• one-to-one
• one-track
• one-trick pony
• one-two
• one-twos
• one-upmanship
• on every hand
• one-way
• one way and another
• one-way glass
• one-way mirror
• one way or the other