defrost UK /diːˈfɹɒst/US /diːˈfɹɔst/verb 3noun 1forms 3 verb3 •To remove frost from.I have just defrosted the fridge. •To thaw (something).Will you defrost the chops for supper tonight? •(informal) To recover from something tiresome.See you tomorrow evening; I'll have defrosted from my trip by then. noun1 •The removal of frost.But only recently has automatic quick defrost appeared on production models of domestic refrigerators. — 1953 formsdefrosted · defrosting · defrosts