noun

a curved flat piece of wood that can be thrown so that it will return to the thrower, traditionally used by Australian Aboriginal people as a hunting weapon.

verb

(of a plan or action) recoil on the originator.

misleading consumers about quality will eventually boomerang on a car-maker

backfire,recoil,reverse,rebound,come back,bounce back,spring back,return,ricochet,have an adverse effect,have unwelcome repercussions,be self-defeating,blow up in one’s face,redound