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Definition of All at once
1. Adverb. All at the same time. "Let's say `Yes!' all at once"
Exact synonyms: All Together
2. Adverb. Without warning. "All at once, he started shouting"
Exact synonyms: All Of A Sudden
Definition of All at once
1. Adverb. (idiomatic) Unexpectedly; without warning; all of a sudden. ¹
2. Adverb. (&lit All at the same time; all together) ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of All At Once
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