This is the 1892nd most frequent French word.
pieds
"Feet" (plural of "foot").
Here, 'pieds' is used to mean 'feet' in the context of being without shoes.
Il marche pieds nus sur le sable.
He walks barefoot on the sand.
In this sentence, 'pieds' refers to the physical part of the body—the feet—that require support while walking.
Elle a acheté des chaussures de marche pour ses pieds.
She bought walking shoes for her feet.
Here, 'pieds' signifies the part of the body submerged in water during play.