from The American Heritage® Dictionary of the English Language, 4th Edition
- n. One who agrees to remain sober, as at a party, in order to be able to drive others home safely.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An individual who does not drink alcohol at a social engagement for the purpose of driving his or her companions home.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the member of a party who is designated to refrain from alcohol and so is sober when it is time to drive home
Sorry, no etymologies found.