Source : Webster's Revised Unabridged Dictionary (1913)

Tread \Tread\, v. i. [imp. {Trod}; p. p. {Trodden}, {Trod}; p.
   pr. & vb. n. {Treading}.] [OE. treden, AS. tredan; akin to
   OFries. treda, OS. tredan, D. & LG. treden, G. treten, OHG.
   tretan, Icel. tro?a, Sw. tr[*a]da, tr["a]da, Dan. tr[ae]de,
   Goth. trudan, and perhaps ultimately to F. tramp; cf. Gr. ? a
   running, Skr. dram to run. Cf. {Trade}, {Tramp}, {Trot}.]
   1. To set the foot; to step.

            Where'er you tread, the blushing flowers shall rise.
                                                  --Pope.

            Fools rush in where angels fear to tread. --Pope.

            The hard stone Under our feet, on which we tread and
            go.                                   --Chaucer.

   2. To walk or go; especially, to walk with a stately or a
      cautious step.

            Ye that . . . stately tread, or lowly creep.
                                                  --Milton.

   3. To copulate; said of birds, esp. the males. --Shak.

   {To tread on} or {upon}.
      (a) To trample; to set the foot on in contempt. ``Thou
          shalt tread upon their high places.'' --Deut. xxxiii.
          29.
      (b) to follow closely. ``Year treads on year.''
          --Wordsworth.

   {To tread upon the heels of}, to follow close upon.
      ``Dreadful consequences that tread upon the heels of those
      allowances to sin.'' --Milton.

            One woe doth tread upon another's heel. --Shak.