कष्

Etymology
From a colloquial form of the root. Pokorny's original derivation from a supposed (for which he cites, , and ) is obsolete.

Root

 * 1) to rub, scratch, scrape
 * 2) to itch
 * 3) to rub with a touchstone, test, try
 * 4) to injure, hurt, destroy
 * 5) to leap