bump

n.碰撞，颠簸；肿块 v.碰撞，颠簸　

bullfight, bullfighter, bullfighting, bullfinch, bullfrog, bullhorn, bullion, bullish, bullock, bullring, bullshit, bully, bully-boy, bulrush, bulwark, bum, bumble, bumble-bee, bumbling, bumf (also bumph), bumper, bumper-to-bumper, bumph, bumpily, bumpiness, bumpkin, bumptious, bumptiously, bumptiousness, bumpy, bun, bun-fight, bunch, bundle, bung, bung-hole, bungalow, bungle, bungler, bungling,