Susah (סוּסָה) is the feminine form of sus (horse), meaning a mare or female horse. It appears only once in the Hebrew Bible — in the Song of Solomon 1:9 — in one of the most striking compliments in ancient literature. The mare in Egypt's chariot forces was famous for her ability to disrupt enemy battle formations, making this a surprisingly martial image of beauty and power.
In Song of Solomon 1:9, the beloved is compared to a mare among Pharaoh's chariots. This was not a backhanded compliment — Egyptian military power was renowned, and the king's personal chariot mares were the most prized animals in the ancient world. To compare a woman to Pharaoh's mare was to say: you are incomparably beautiful, powerful, and attention-commanding. The image anticipates Revelation's bride adorned for her husband.
The Song of Solomon uses susah to open the description of the beloved — and the rest of the Song deepens and spiritualizes this portrait. The Church is Christ's bride, adorned and beautiful. The same God who called His beloved a susah — a powerful, beautiful mare — will present His Church 'without stain or wrinkle... holy and blameless' (Ephesians 5:27) at the great wedding feast.