They will stretch out their hands in it, as swimmers stretch out their hands to swim. God will bring down their pride despite the cleverness of their hands.
NIV
And though [Moab] stretches forth his hands in the midst of [the filthy water] as a swimmer stretches out his hands to swim, the Lord will bring down [Moab's] pride in spite of the skillfulness of his hands and together with the spoils of his hands.
AMP
And he shall spread forth his hands in the midst of them, as he that swimmeth spreadeth forth his hands to swim: and he shall bring down their pride together with the spoils of their hands.
KJV