from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Football The first in the series of four downs in which an offensive team must advance ten yards to retain possession of the ball.
- n. Football A gain of ten or more yards entitling the offensive team to a new series of downs.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The first play in a series that has a maximum of four downs.
- n. The act of getting a first down by advancing the ball more than ten yards ahead of the field position where the team took possession.
Sorry, no etymologies found.