de ‧ frost /ˌdiːˈfrɒst $ -ˈfrɒːst/ BrE AmE verb
1 . [intransitive and transitive] if frozen food defrosts, or if you defrost it, it gets warmer until it is not frozen ⇨ melt , thaw
2 . [intransitive and transitive] if a ↑ freezer or ↑ refrigerator defrosts, or if you defrost it, it is turned off so that the ice inside it melts
3 . [transitive] American English to remove ice from inside the windows of a car by using heat or warm air