Definitions of bat:

• noun:   (baseball) a turn batting

  Example: "He was at bat when it happened"

• noun:   nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate
• noun:   a club used for hitting a ball in various games
• noun:   a bat used in playing cricket
• noun:   a small racket with a long handle used for playing squash
• verb:   wink briefly

  Example: "Bat one's eyelids"

• verb:   beat thoroughly in a competition or fight
• verb:   strike with, or as if with a baseball bat

  Example: "Bat the ball"

• verb:   use a bat

  Example: "Who's batting?"

• verb:   have a turn at bat

  Example: "Jones bats first, followed by Martinez"