from
The Collaborative International Dictionary of English v.0.48
Gum \Gum\, v. t. [imp. & p. p. {Gummed} (g[u^]md); p. pr. & vb.
n. {Gumming}.]
1. To smear with gum; to close with gum; to unite or stiffen
by gum or a gumlike substance; to make sticky with a
gumlike substance.
[1913 Webster]
He frets like a gummed velvet. --Shak.
[1913 Webster]
2. To chew with the gums, rather than with the teeth.
[PJC]
{gum up}
(a) To block or clog (a conduit) with or as if with gum;
as, to gum up the drainpipe.
(b) to interfere with; to spoil. [Slang]
[PJC]