buttonhook

n hook for pulling a button into place through a buttonhole 钮扣钩（牵引钮扣穿过钮扣孔的钩）.

butcher, butcher's shop, butchery, butler, butt, butter, butter-bean, butter-fingers, buttercup, butterfly, buttermilk, butterscotch, buttery, buttock, button, button mushroom, button up, button-down, buttoned up, buttonhole, buttress, buxom, buy, buy off, buy out, buy up, buyer, buzz, buzz off, buzz-word, buzzard, buzzer, by, by accident, by air, by all means, by all nerves, by analogy, by and by, by and large,