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at once

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1

At the same time, as in We can't all fit into the boat at once. [First half of 1200s] Also see at one time, def. 1.

2

Immediately, as in Mother told the children to come inside at once. [First half of 1500s]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

How to use at once in a sentence

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