The Collaborative International Dictionary of English v.0.48:
Touch \Touch\, v. i.
1. To be in contact; to be in a state of junction, so that no
space is between; as, two spheres touch only at points.
2. To fasten; to take effect; to make impression. [R.]
Strong waters pierce metals, and will touch upon
gold, that will not touch upon silver. --Bacon.
3. To treat anything in discourse, especially in a slight or
casual manner; -- often with on or upon.
If the antiquaries have touched upon it, they
quitted it. --Addison.
4. (Naut) To be brought, as a sail, so close to the wind that
its weather leech shakes.
To touch and go (Naut.), to touch bottom lightly and
without damage, as a vessel in motion.
To touch at, to come or go to, without tarrying; as, the
ship touched at Lisbon.
To touch on or To touch upon,
(a) to come or go to for a short time. [R.]
I made a little voyage round the lake, and
touched on the several towns that lie on its
(b) to discuss briefly, as only a small part of a