other day, the

other day, the idiom
One day recently, a short time ago, as in I saw her in the museum the other day. This term originally meant either “the next day” or “the preceding day” (tomorrow or yesterday). In its current meaning it was first recorded in 1421.

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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