From rabab; or ribbow {rib-bo'} from rabab; a myriad, i.e. Indefinitely, large number -- great things, ten ((eight)-een, (for)-ty, + sixscore, + threescore, X twenty, (twen)-ty) thousand.
KJV: And when he hath taken away the multitude, his heart shall be lifted up; and he shall cast down many ten thousands: but he shall not be strengthened by it.
NASB: "When the multitude is carried away, his heart will be lifted up, and he will cause tens of thousands to fall; yet he will not prevail.