Backwash v. i. : To clean the oil from (wood) after combing.

Example:
how do I Backwash a pool filter?

Taxonomy
backward, filter backwash, beach, Dictionary, Military Dictionary, wave, swash, geology, the action, oars, propeller, aircraft, motion, Translations, Unanswered questions, US Military, gradient, pool filter.

Defination from the web:
backwash n. A backward flow of water, as from the action of oars. See backrush . A backward flow of air, as from the propeller of an aircraft ... Steep waves and long waves are linked with stronger backwash, and hence flatter beach gradients. ...