be (of) no use to man or beast

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be (of) no use to man or beast

To be completely useless; to serve no purpose; to be unsuitable to anyone or anything. I admire the intelligence with which you argue your points, friend, but unless you're willing to put your words into action, I'm afraid your philosophizing is of no use to man or beast. After 20 years, my faithful old truck finally broke down for good. It's no use to man or beast anymore.
See also: beast, man, use