(typography, now chiefly historical) A temporary print made from a thin coating of carbon deposited on the punch surface by a candle flame, used in evaluating the progress of the design of the punch.

plural of page proof

plural of proof of concept

plural of galley proof

Of a book, film, etc.: guaranteed to succeed even if it receives unfavourable reviews.

(informal, humorous) Incapable of being misused even by the most stupid or careless of users.

Alternative spelling of ovenproof

To render something idiot-proof.

plural of negative proof

Resistant to rabbits.