Longman Dictionary English From Longman Dictionary of Contemporary EnglishRelated topics: Motor vehiclesdefogde‧fog /diːˈfɒɡ $ -ˈfɑːɡ, -ˈfɒːɡ/ verb (defogged, defogging) [transitive] TTC American English to remove mist from the windows inside a car, by using heat SYN demist British English→ See Verb table ldoceonline.com