Idiomatic (foaled January 27, 2019) is a retired Champion American thoroughbred racehorse who has won multiple Grade I events in 2023, including the Personal Ensign Stakes at Saratoga Race Course, Spinster Stakes at Keeneland and Breeders' Cup Distaff at Santa Anita Park.

[2] Idiomatic is a bay mare that was bred in Kentucky by Fahad bin Khalid's Juddmonte Farms.

Her sire is Curlin, the 2007 and 2008 American Horse of the Year and stands at Hill 'n' Dale Farms in Kentucky.

Her dam is Lockwood, a full sister to 2014 US Champion Older Female Horse and multiple Grade 1 winner Close Hatches.

[5] During preparations for the 2024 Breeders' Cup, Idiomatic was found to be lame and an issue, that should heal readily, was identified in her left knee.