back the wrong horse

Also, bet on the wrong horse. Guess wrongly or misjudge a future outcome, as in Jones garnered only a few hundred votes; we obviously backed the wrong horse, or Counting on the price of IBM to rise sharply was betting on the wrong horse. Transferred from wagering money on a horse that fails to win the race, a usage dating from the late 1600s, this term is widely applied to elections and other situations of uncertain outcome.

In addition to the idioms beginning with horse

• horse around
• horse of a different color, a
• horse sense
• horse trading

also see:

• back the wrong horse
• beat a dead horse
• cart before the horse
• change horses in midstream
• charley horse
• dark horse
• eat like a bird (horse)
• from the horse’s mouth
• hold one’s horses
• if wishes were horses
• look a gift horse in the mouth
• on one’s high horse
• war horse
• wild horses couldn’t drag
• work like a beaver (horse)
• you can lead a horse to water