1
a
: to step or walk on or over
b
: to walk or proceed along : follow
treading a fine line between tradition and innovation
4
: to copulate with
—used of a male bird
1
: to move or proceed on or as if on foot
must tread lightly
2
a
: to set foot
has gone where others fear to tread
b
: to put one's foot : step
carelessly treading on the flowers
3
: copulate
treader
noun
1
a(1)
: the part of a wheel or tire that makes contact with a road or rail
(2)
: the pattern of ridges or grooves made or cut in the face of a tire
b
: the part of a shoe or boot sole that touches the ground
also
: the pattern on the bottom of a sole
2
a
: the upper horizontal part of a step
b
: the width of such a tread
3
4
: a mark (something, such as a footprint or the imprint of a tire) made by or as if by treading
5
: the distance between the points of contact with the ground of the two front wheels or the two rear wheels of a vehicle
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Merriam-Webster unabridged
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