de‧frost /ˌdiːˈfrɒst $ -ˈfrɒːst/ 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

[TahlilGaran] Dictionary of Contemporary English ▲