at once

Idioms & Phrases

at once

  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]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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