all at once

1. 1.

   all at the same time

   “Let's say `Yes!' all at once”

   Synonymsall together
2. 2.

   without warning

   “all at once, he started shouting”

   Synonymsall of a sudden

Questions about all at once

What does all at once mean?

all at once means "all at the same time". That is the primary sense; the word has 2 in total, listed in full on this page.

What is another word for all at once?

Close synonyms include all together, all of a sudden. Each sense on this page lists its own synonyms, because a word with several meanings rarely has one substitute that works for all of them.

Is all at once a common word?

all at once is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.