horse sense

horse sense idiom
Sound practical sense, as in She's got too much horse sense to believe his story. The exact allusion in this term, which dates from the mid-1800s, is disputed, since some regard horses as rather stupid. However, they tended to be viewed more positively in the American West, where the term originated.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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