PS

*gar(i)d- - back of neck (SED I No. 92)

Cf. *ḳard- ‘neck, throat’; variant roots with g vs. ḳ?

Arabic
ǯarad- - dos (back) (BK 1 276)
Arabic
ˀaǯrad- - dos (back) (BK 1 277)
With ˀa- prefixed
Tigre
ǯärid - (muscles of the) neck (WTS 550)
Selti
gərdid - nape of neck (EDG 291)