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The following 4 entries include the term proof of.
proof of concept
noun: something that demonstrates the feasibility of a concept (such as a product idea or a business plan) —often hyphenated when used before another noun
policy proof of interest
: a marine insurance policy provision whereby the underwriter agrees to dispense with all proof of insurable interest with the policy being stamped accordingly
proof of purchase
noun phrase: evidence showing that something was bought
the proof of the pudding is in the eating
idiom—used to say that a person can only know if something is good or bad by trying it
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- Before we went to her house, Hannah told us her aunt was a flibbertigibbet.
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Merriam-Webster unabridged
