horse sense

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Common sense; gumption.

from The Century Dictionary.

• noun A crude, instinctive kind of common sense, independent of instruction or experience; a coarse, robust, and conspicuous form of shrewdness often found in ignorant and rude persons; plain, practical good sense.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun idiomatic Common sense, especially with a connotation of folk wisdom independent from, and trumping, formal education.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun sound practical judgment