C. F. Keil and Franz Delitzsch on Proverbs 1:15

Pro 1:15

After the men are described against whose enticements a warning is given forth, the warning is emphatically repeated, and is confirmed by a threefold reason:

My son! go not in the way with them.

Keep back thy foot from their path.

If בּדרך (in the way), taken alone, cannot be equivalent to בדרך אחד (in one way), so is אתּם (with them) to be regarded as its determination.The Arab. grammarians regard this as half determination, and call it takhsys; that אתּם has with them the force of a virtually coordinated attributive; while, according to the Arab. gram., it is also possible that בּדרך, “in one way,” is equivalent to on the common way, for in the indetermination sometimes there lies the conception not merely of âhad, but of weahad.

Foot (not feet), as eye, hand, etc., is used where the members come less under consideration than what they unitedly bring about (Pro 4:26.). נתיבה, from נתב, signifies properly that which is raised, especially the (raised) footstep.