Arabic

ǯfǯf - s'agiter, hérisser ses plumes et lever les ailes, comme fait un oiseau qui couve ses oeufs, à l'approche d'un ennemi (to flutter, bristle its feathers and lift its wings, like a bird that incubates its eggs, when an enemy approaches) (BK 1 303)

PS
*gapp-, *ˀa-gapp- - wing (SED I No. 88)
There is a trend to compare this root with Sem. *gd/ḏp ‘to fly’ > *gadp- ‘wing’ implying a secondary formation with loss of *-d-, which is unlikely