زَغَبٌ

[Down:] or the yellow [down resembling] small hairs upon the feathers of the young bird: (S:) or small and soft hair and feathers: or each of these when first coming forth: (A, K:) i. e. (TA) the small and soft hair when it first appears, of a young child, (Msb, TA,) and of a colt [or foal]; (JK, * TA;) and likewise of an old man, when his hair becomes thin and weak; (Msb;) and the feathers when they first appear, (Msb, TA,) of the young bird: (TA:) and small feathers that do not become long nor good: (JK, Msb:) n. un. with ة: (TA:) and what remains upon the head of an old man when his hair has become thin. (K.)

[Hence,] أَخَذَهُ بِزَغَبِهِ (assumed tropical:) He took it at its commencement, or in its first and fresh state. (JK, K.) And أَخَذَهُ بِزَغَبِ رَقَبَتِهِ [lit. He took him by the down of his neck;] meaning (assumed tropical:) he overtook him. (JK.)