Wiktionary
interj. (context baseball English) (Used by an umpire to invite the next batter to the batter's box, especially at the beginning of a half-inning.)
Wikipedia
Batter up or Batter Up may refer to:
Usage examples of "batter up".
Another possibility, more perilous for the Mets, is that with Ken taking first on a walk and the bases loaded, the next batter up might put the Carp into an advantageous scoring position.
He stalked into the box, unmindful of the hooting crowd and grimly faced Schultz, the first batter up for the Bisons.
Next batter up hit a worm-burner to third and the hitter was thrown out at first to retire the side.
The triplets held a conference to choose positions, while Nicky signed that Matt should be the first batter up.
They probably burned the planes, and tried to batter up the rest of it with rocks and things.
My instinct is a winning coach, and when it said Batter up, I didn't arÂgue that I wasn't ready for the game.
He had not figured the man would be fool enough to drive headlong at the door, batter up the machine so that it might have to be abandoned immediately.