Definitions of swab:

• noun:   cleaning implement consisting of absorbent material fastened to a handle; for cleaning floors
• noun:   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
• verb:   wash with a swab or a mop

  Example: "Swab the ship's decks"

• verb:   apply (usually a liquid) to a surface
• name:  A surname (very rare: popularity rank in the U.S.: #39083)