a while back

a while back idiom
Also, a while ago. Some time in the past, as in I ran into Barbara a while back but didn't get her new address, or John wrote me a while ago about his new baby. This term uses a while in the sense of “a short or moderate time,” a usage dating from about 1300.

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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