wash off

动词 wash off:

1. remove by the application of water or other liquid and soap or some other cleaning agent
   同义词：wash, wash out, wash away

1. Those grease stains won't wash off.
   这些油迹洗不掉。
2. Please wash that mud off (your boots) before you come in.
   请你先把(靴子上的)泥洗掉再进来。