1 PHRASAL VERB (用砂纸等)打磨平滑 If you rub down a rough surface, you make it smooth by rubbing it with something such as sandpaper. (用砂纸等)打磨平滑 [Also VERB n PREPOSITION]
2 PHRASAL VERB (用布、毛巾等)擦干,按摩 If you rub someone down, you dry them or massage them with something such as a towel or cloth. (用布、毛巾等)擦干,按摩