Sakhinat is feminine singular past from s-kh-n, ‘she grew warm.’ Khaffa is masculine singular past from kh-f-f, with ʿiẓāmuhā (her bones) as its following subject; a non-human plural can take singular verbal agreement.
Khaffa ʿiẓāmuhā need not mean that bones literally lost mass. It expresses the sensation of increasingly free, nimble motion as the mount warms to its pace.
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Labīd ibn Rabīʿah: Cold-Morning Generosity, Defence and a Swift Horse (Verses 62–69)
Sakhinat is feminine singular past from s-kh-n, ‘she grew warm.’ Khaffa is masculine singular past from kh-f-f, with ʿiẓāmuhā (her bones) as its following subject; a non-human plural can take singular verbal agreement.
Khaffa ʿiẓāmuhā need not mean that bones literally lost mass. It expresses the sensation of increasingly free, nimble motion as the mount warms to its pace.