1
[ adverb ] all at the same time

Synonyms

all_together

Examples

"Let's say `Yes!' all at once"

2
[ adverb ] without warning

Synonyms

all_of_a_sudden

Examples

"all at once, he started shouting"

Used in print

(Peter J. White, "Report on Laos"...)

The young_man spoke steadily enough , but all_at_once he looked grotesquely unshaven .

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