TgJ 1K15:23var. :לְחוֹד לְעִדָן סֵיבְתֵיה מְרַע"אִתמְרַע" בְרַגלוֹהִי‏ : but in his old age he became sick in his legs
See the entire entry for mrˁ vb. to be sick

TgJ 1K15:23 :לְעִדָן סֵיבְתֵיה"סיבותיה" מְרַע בְרַגלוֹהִי‏ : during his old age he became sick in his feet
See the entire entry for sybh n.f. old age