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Related to on end: calling it a day
Continuously and without stopping. Used after a unit of time, such as "hours" or "days." I could talk for hours on end about trains. Out in this part of the country, the wind howls for days on end.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
1. Having one end down; upright: books placed on end on the shelf.
2. Without stopping: drove for hours on end.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.