Definition of "all of a sudden" [all of a sudden]

• Suddenly, quickly. (adverb)

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• "Am I supposed to care that my father, who went three years when I was a child without a single phone call, letter, or visit to me, on account of being too wasted to remember the fact of his seedage left behind in Georgetown, has all of a sudden decided to care?"
• "I was going down Eisenhower Drive, and all of a sudden the car in front of me stopped short."
• "But all of a sudden Roger Bortch broke into a trusting, masculine grin."