open daylight
v. phr.— «Before the Girl got down to business again the Maid opened daylight between them, but losing her grip before reaching the home stretch on the first half mile, the Girl gathered her in and showed her heels to the pacer to the finish.» —“The Fourth’s Furore” Bismarck Tribune (Dakota Territory) July 7, 1882. (source: Double-Tongued Dictionary)