This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. Below or under the foot or feet; against the ground: trampled the beans underfoot.

ad. At or under the foot or feet; on the ground: moist, cool, soft grass growing underfoot.

ad. Hindering progress; in the way: pets, toys, and children underfoot.

adj. Situated under one’s feet.

ad. Under one's feet.

ad. In the way; situated so as to obstruct or hinder.

n. Below par.

preposition. See under Foot, n.

ad. Under the feet; underneath; below. See Under foot, under foot, n.

adj. Low; base; abject; trodden down.

Under the feet; underneath; beneath; below.

Low; base; abject; trodden down.

To underpin.

ad. under the feet

ad. in the way and hindering progress

"And when earthquakes hit mining regions, remember that the ground underfoot is mostly hollow."

foot   

underneath    low    base    abject   

Foot    afoot    caput    foot    pussyfoot    put    soot