open (up) daylight v. phr. especially in horse racing, to out-distance a competitor. (source: Double-Tongued Dictionary)
Further reading
Barbara in Jacksonville, Florida, recalls her grandmother saying she liked her coffee strong enough to tote double and kick up behind. The expression tote double refers to the action of a horse carrying two people. If a horse is able to kick up...
Robert Charles Hope, inventor of the crank used to adjust the tension on a tennis net, is among thousands of readers who in the late 19th century responded to a call from the Oxford English Dictionary to send in citations for notable words they...