idiom: to back the wrong horse

[Monno]

English Language Tests, Intermediate level

ESL/EFL Test #308 "English Slang Idioms (30)", question 2

"I think Craig is backing the wrong ......... on this one. Jack's idea failed in the past but Nathan's idea is new and seems more feasible", Kathy said to her coworkers.

(a) horse
(b) puppy
(c) camel
(d) answer

English Language Tests, Intermediate level

ESL/EFL Test #308 "English Slang Idioms (30)", answer 2

"I think Craig is backing the wrong horse on this one. Jack's idea failed in the past but Nathan's idea is new and seems more feasible", Kathy said to her coworkers.

Correct answer: (a) horse
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what is the answer and why?

Monno

[Linda]

Hello,
The definition is as follows: "When you back the wrong horse, you are supporting the losing side." This is a common expression used in English - an idiom.
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