Etymology
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horse sense (n.)

1832, American English colloquial, from horse (n.), perhaps in referfence to the animal's qualities, or to the abilities of hostlers and coachmen with the animals, perhaps from the same association of "strong, large, coarse" found in horseradish.

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Definitions of horse sense

horse sense (n.)
sound practical judgment;
Synonyms: common sense / good sense / gumption / sense / mother wit
From wordnet.princeton.edu