- 1[intransitive, transitive] fog (something) (up) if a glass surface fogs or is fogged up, it becomes covered in steam or small drops of water so that you cannot see through
- 2[transitive] fog something to make somebody/something confused or less clear I tried to clear the confusion that was fogging my brain. The government was trying to fog the real issues before the election. Word Origin mid 16th cent.: perhaps a back-formation from foggy.
BrE BrE//fɒɡ//; NAmE NAmE//fɔːɡ//, NAmE//fɑːɡ//Verb Forms present simple I / you / we / they fog
BrE BrE//fɒɡ//; NAmE NAmE//fɔːɡ//, NAmE//fɑːɡ//he / she / it fogs
BrE BrE//fɒɡz//; NAmE NAmE//fɔːɡz//, NAmE//fɑːɡz//past simple fogged
BrE BrE//fɒɡd//; NAmE NAmE//fɔːɡd//, NAmE//fɑːɡd//past participle fogged
BrE BrE//fɒɡd//; NAmE NAmE//fɔːɡd//, NAmE//fɑːɡd//-ing form fogging
BrE BrE//ˈfɒɡɪŋ//; NAmE NAmE//ˈfɔːɡɪŋ//, NAmE//ˈfɑːɡɪŋ//