see Ps 74:13. The word used is "Rahab", one of the names of Egypt, Ps 87:4; and so Jarchi interprets it of the Egyptians, who were smitten of God with various plagues, and particularly in their firstborn; and at last at the Red sea, where multitudes perished, and Pharaoh their proud king, with his army; who was an emblem of the devil, whose sin, the cause of his fall and ruin, was pride; and the picture of proud and haughty sinners, whose destruction sooner or later is from the Lord; and which is an instance of his wisdom and understanding, who humbles the proud, and exalts the lowly.
Myh egr "pacavit mare", Bolducius; "quiescit mare ipsum", Vatablus; so Sept.