Collins COBUILD Advanced Learner's English Dictionary - -proof

(-proofs, -proofing, -proofed) 1. -proof combines with nouns and verbs to form adjectives which indicate that something cannot be damaged or badly affected by the thing or action mentioned. ...a bomb-proof aircraft... In a large microwave-proof dish, melt butter for 20 seconds. COMB in ADJ 2. -proof combines with nouns to form verbs which refer to protecting something against being damaged or badly affected by the thing mentioned. ...home energy efficiency grants towards the cost of draught-proofing your home. ...inflation-proofed pensions. COMB in VERB: V n, V-ed 3. see also bullet-proof, childproof, damp-proof course, fireproof, ovenproof, soundproof, waterproof, weatherproof