Arabic

qdḥ - II. s’enfoncer dans l’orbite (se dit de l’oeil); amaigrir exprès (son cheval) (to sink into the orbit (said of the eye); to lose weight on purpose (of horse) (BK 2 684, Lane 2492)

Related with a peculiar meaning shift.

PS
*ḳdḥ - to have inflammation (SED I No. 35v)
Must be eventually derived from PS *ḳdḥ ‘to light up fire’.