C. F. Keil and Franz Delitzsch on Proverbs 31:17

Pro 31:17

The poet has this augmented household wealth in his eye, for he continues: 17 ח She girdeth her loins with strength,         And moveth vigorously her arms.

Strength is as the girdle which she wraps around her body (Psa 93:1). We write חגרה בעוז; both words have Munach, and the ב of בעוז is aspirated. Thus girded with strength, out of this fulness of strength she makes firm or steels her arms (cf. Psa 89:22). The produce of the field and vineyard extend far beyond the necessity of her house; thus a great portion is brought to sale, and the gain thence arising stimulates the industry and the diligence of the unwearied woman.