The size or extent of a head used as a rough unit of measurement. Originally Horse Racing. With reference to the amount by which one horse is ahead…

Horse Racing. The length of a horse's neck, used as a measurement of the distance separating two horses at the finishing line of a race; esp. in (to w…

to win in a canter: to distance all the other horses in a race so much that galloping is unnecessary at the end; figurative to come off victor…

to win cleverly: (in horse racing) to win neatly after a close contest, with rather more advantage than seemed likely.