horsing

1. To frolic, to act mischievously. (Usually followed by "around".)
2. To provide with a horse; supply horses for.
3. To get on horseback.
4. To sit astride of; to bestride.
5. (of a male horse) To copulate with (a mare).
6. To take or carry on the back.
7. To place (someone) on the back of another person, or on a wooden horse, etc., to be flogged; (hence) to flog.
8. To urge at work tyrannically.
9. To charge for work before it is finished.

noun

The military punishment of placing somebody on the back of another person, or on a wooden horse, etc., to be flogged.