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to and fro
to and fro idiom
Back and forth, as in He was like a caged animal, pacing to and fro. Strictly speaking, to means “toward” and fro “away from,” but this idiom is used more vaguely in the sense of “moving alternately in different directions.” [First half of 1300s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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