mail it in
v. phr.— «Experienced horses may cheat or protect themselves during a race (in human sports vernacular they are “mailing it in”).» —by John Lindley Handicapping for Bettor Or Worse Apr. 25, 2004. (source: Double-Tongued Dictionary)
Further reading
In the 15th century, the word respair meant “to have hope again.” Although this word fell out of use, it’s among dozens collected in a new book of soothing vocabulary for troubled times. Plus, baseball slang: If a batter...
Quiz Guy John Chaneski insists that the names of modern Olympic sports resulted from changing one letter in the original names for each activity. For example, he says, the pole vault must have originated from an earlier sport in which participants...