roughen

vt.vi. (使)变粗糙

rotisserie, rotor, rotten, rottenly, rottenness, rotter, rotund, rotunda, rotundity, rotundly, rouble (also ruble), roue, rouge, rough, rough house, rough luck, rough-and-tumble, rough-hewn, roughage, roughcast, roughly, roughneck, roughness, roughshod, roulette, round, round and round, round brackets, round off, round robin, round trip, round up, round-eyed, round-shouldered, round-table, round-up, roundabout, rounded, roundel, rounders,