from The American Heritage® Dictionary of the English Language, 4th Edition
- intransitive v. Baseball To bat in place of a player scheduled to bat, especially when a hit is badly needed.
- intransitive v. Informal To substitute for another in a time of need.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To bat in place of another player
- v. To do something in the place of another person who is not able to perform or is less skilled; to substitute or stand in for somebody.
Sorry, no etymologies found.