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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 at a time.
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.
1. Having one end down; upright: books placed on end on the shelf.
2. Without stopping: drove for hours on end.