from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A turn, as by a vehicle, completely reversing the direction of travel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A turn in a vehicle carried out by driving in a semicircle in order to travel in the opposite direction.
- n. A reversal of policy; a volte-face, a backflip
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. complete reversal of direction of travel
U + turn, from the similarity to the shape of the letter U. (Wiktionary)