Albert Barnes Commentary Deuteronomy 33:11

"Bless, Jehovah, his substance, And accept the work of his hands: Smite through the loins of them that rise up against him, And of them that hate him, that they rise not again." — Deuteronomy 33:11 (ASV)

Smite through the loins — Rather, strike the loins, that is, the seat of their strength.