A boomerang is a curved piece of wood that returns to the thrower if tossed correctly. To boomerang is to bounce back to a previous position like a boomerang.
This word comes whirling to us from an Australian language (Dharuk). The primary meaning is the curved stick that returns to its owner after being thrown. Not just anyone can make a boomerang return: it takes practice and skill. Because a boomerang returns to its original point, it’s also a verb for things that return. This is often used negatively for things you would rather not see again: if a lie boomerangs, it comes back to haunt you.