horse sense (n.)youdaoicibaDictYouDict[horse sense 词源字典]
1832, American English colloquial, from horse (n.), perhaps in referfence to the animal's qualities, or the abilites of hostlers and coachmen with the animals, perhaps from the same association of "strong, large, coarse" found in horseradish.[horse sense etymology, horse sense origin, 英语词源]