King James Version (KJV)
Then were the horsehoofs broken by the means of the pransings, the pransings of their mighty ones. {pransings: or, tramplings, or, plungings}
Modern English
Then the horse hoofs stamped because of the prancing, the prancing of their strong ones.
Hebrew
אָ֥ז הָלְמ֖וּ עִקְּבֵי־ס֑וּס מִֽדַּהֲר֖וֹת דַּהֲר֥וֹת אַבִּירָֽיו׃
ʾaz halmv ʿiqbey-svs midaharvot daharvot ʾabiyrayv