on end

on end idiom
Continuously, without interruption, as in It's been raining for days on end. This term, which might just as well be put “seemingly without end,” dates 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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