The Collaborative International Dictionary of English v.0.48:
Trail \Trail\ (tr[=a]l), v. t. [imp. & p. p. Trailed; p. pr. &
vb. n. Trailing.] [OE. trailen, OF. trailler to trail a
deer, or hunt him upon a cold scent, also, to hunt or pursue
him with a limehound, F. trailler to trail a fishing line;
probably from a derivative of L. trahere to draw; cf. L.
traha a drag, sledge, tragula a kind of drag net, a small
sledge, Sp. trailla a leash, an instrument for leveling the
ground, D. treilen to draw with a rope, to tow, treil a rope
for drawing a boat. See Trace, v. t.]
(a) To hunt by the track; to track.
(b) to follow behind.
(c) To pursue. --Halliwell.
[1913 Webster +PJC]
2. To draw or drag, as along the ground.
And hung his head, and trailed his legs along.
They shall not trail me through their streets
Like a wild beast. --Milton.
Long behind he trails his pompous robe. --Pope.
3. (Mil.) To carry, as a firearm, with the breech near the
ground and the upper part inclined forward, the piece
being held by the right hand near the middle.
4. To tread down, as grass, by walking through it; to lay
5. To take advantage of the ignorance of; to impose upon.
I presently perceived she was (what is vernacularly
termed) trailing Mrs. Dent; that is, playing on her
ignorance. --C. Bronte.