From Longman Dictionary of Contemporary Englishall of a suddenall of a suddenSUDDENLYsuddenly All of a sudden the lights went out. → sudden
Examples from the Corpus
all of a sudden• It got him trying to be too perfect with his pitches all of a sudden.• The way he decided to leave all of a sudden didn't make any sense.• You put the chair up, and all of a sudden, he has four points of interest.• And all of a sudden I got slammed in the face.• All of a sudden I realized that the car in front of me wasn't moving.• In spring training I started off good with my throwing, and then all of sudden it declined.• Then, all of a sudden, like a spigot turned counterclockwise, B shuts down.• But as revenues subsided, costs all of a sudden mattered, too.• The kitchen had gone quiet, all of a sudden, really quiet.• Now, all of a sudden, things are different.• We waited and waited, then all of a sudden we saw a sail on the horizon. 