boomerang

n.自食其果的行为

bookable, bookbinder [C], bookbinding [U], bookcase, bookie, booking, bookish, bookishness, bookkeeper [C], bookkeeping [U], booklet, bookmark (also bookmarker), bookmobile, books, bookseller, bookshelf, bookshop (US also bookstore), bookstall, bookstore, bookworm, boom, boom town, booming, boon, boor, boorish, boorishly, boorishness, boost, booster, boot, bootee, booth, bootlace, bootleg, bootlegger, bootless, bootstrap, booty, booze, booze-up, boozer,