It (a thing) became bowed, or bent; as also ↓استقوس: (TA:) the ↓ latter is also said, tropically, of the moon when near the change [&c.]. (A, TA.)
2.
(tropical:) He (an old man, S, A) became bowed, or bent; (A, * K;) as also ↓قَوَّسَ, verbal noun تَقْوِيسٌ; (S, A, * Msb, K;) and ↓استقوس; (S;) and ↓اقوس: (A:) or he became bowed, or bent, in the back; as also ↓قَوَّسَ; and ↓استقوس; (TA;) and so ↓قَوِسَ, aorist
قَوَسَ, verbal noun قَوَسٌ. (K.)
3.
-A2- تقوّس قَوْسَهُHe put his bow upon his back. (TA.)