1) Hindering progress 2) How things are often trampled 3) In the way 4) On the ground 5) Under the feet 6) Under the foot or feet 1) Sole 
• (adv.) Under the feet; underneath; below. See Under foot, under Foot, n. • (a.) Low; base; abject; trodden down.
[adv] - in the way and hindering progress 2. [adv] - under the feet
adverb under the feet; `trampled the beans underfoot`; `green grass growing underfoot`
under the foot or feet; on the ground; underneath or below: The climb was difficult because there were so many rocks underfoot. · so as to form an obstruction, as in walking; in the way: the ends of her sash falling constantly underfoot.