n implement consisting of a small piece of cotton that is used to apply medication or cleanse a wound or obtain a specimen of a secretion
n cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors
v wash with a swab or a mop
v apply (usually a liquid) to a surface
n. （医用的）拭子, 药签( swab的名词复数 ); （用拭子取下的）化验标准
v. 用拭子拭抹或擦净（某物）( swab的第三人称单数 ); （用拖把、抹布等）擦洗（某物）