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Definition of All of a sudden
1. Adverb. Without warning. "All at once, he started shouting"
Exact synonyms: All At Once
2. Adverb. Happening unexpectedly. "Suddenly she felt a sharp pain in her side"
Definition of All of a sudden
1. Adverb. (set phrase colloquial) Suddenly, quickly. ¹
¹ Source: wiktionary.com