From Wiktionary, the free dictionary
all at once (not comparable )
( idiomatic ) Unexpectedly ; without warning ; all of a sudden .
1815 , William Wordsworth , The Daffodils :When all at once I saw a crowd, / A host, of golden daffodils
1913 , Joseph C[rosby] Lincoln , chapter IV, in Mr. Pratt’s Patients , New York, N.Y., London: D[aniel] Appleton and Company , →OCLC :I was on my way to the door, but all at once , through the fog in my head, I began to sight one reef that I hadn't paid any attention to afore.
Used other than figuratively or idiomatically: All at the same time; all together .
There are too many to get in the lift all at once , so some must wait.
unexpectedly
Afrikaans: please add this translation if you can
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Czech: najednou (cs)
Danish: please add this translation if you can
Dutch: plotseling (nl) , opeens (nl) , ineens (nl)
Finnish: yhtäkkiä (fi)
French: soudain (fr) , tout d’un coup (fr) , d’un coup d’un seul (fr)
Georgian: უეცრად ( uecrad )
German: auf einmal
Greek: μεμιάς (el) ( memiás )
Ancient: ἀθρόως ( athróōs )
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Hungarian: hirtelen (hu) , váratlanul (hu) , egyszer csak , egyszerre csak
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Italian: tutto in una volta , d'un tratto , tutto d'un tratto
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Polish: znienacka (pl) , nagle (pl) , ni stąd ni zowąd
Portuguese: do nada (pt) , de repente (pt)
Romanian: brusc (ro) , deodată (ro) , dintr-o dată
Russian: вдруг (ru) ( vdrug ) , внеза́пно (ru) ( vnezápno ) , неожи́данно (ru) ( neožídanno )
Serbo-Croatian:
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Vietnamese: trong nháy mắt , trong một nốt nhạc ( Internet slang ) , trong tích tắc
All at the same time, all together
Translations to be checked