Overreach

[Sarah]

The act of striking the heel of the fore foot with the toe ofthe hind foot; -- said of horses.

[Sarah]

Whilst facilitating a public toilet, one reaches around or back too far when attempting to clean and ends up dunking either your entire hand or just your knuckles in the toilet water.

[Rihanna]

to fail by trying to achieve, spend, or do more than you can manage:

[Raeanne Dimick]

beat through cleverness and wit

[Renato]

fail by aiming too high or trying too hard

[Taksi154r]

To defeat ones own purpose by trying to do too much or by trying too hard or with excessive eagerness; -- used reflexively; as, the candidate overreached himself by trying to plant false rumors, which backfired/

[Dave Paprocki]

To reach above or beyond in any direction.

[psycho]

A horse is said to over-reach, when he brings his hinder feet too far forwards, and strikes his toes against his fore shoes. Farr. Dict.