Al-jayb is the neck opening through which the head enters a garment. Qiṭāb al-jayb concerns the collar’s edge or opening, here described as broad. Al-mutajarrad derives from tajarrud, describing the part of the body uncovered when clothing is removed.
Bi-ḥiss al-nadāmā refers to touch or sensory response among the companions. Each term contributes its own aspect—collar, delicacy, touch, or skin—so a single general word such as “beauty” would erase the verse’s lexical distinctions.