Jam, n. 1. A mass
of people or objects crowded together; also, the pressure from a
crowd; a crush; as, a jam in a street; a jam of logs in
a river.
2. An injury caused by jamming.
[Colloq.]
Jam, n. [Prob. fr. jam, v.; but
cf. also Ar. jamad ice, jelly, jāmid congealed,
jamd congelation, ice.] A preserve of fruit boiled with
sugar and water; as, raspberry jam; currant jam; grape
jam.
Jam nut. See Check nut, under
Check. -- Jam weld (Forging),
a butt weld. See under Butt.
Jam (?), n. [Per. or Hind.
jāmah garment, robe.] A kind of frock for
children.
Jam, n. (Mining) See
Jamb.
Jam, v. t. [imp. & p.
p. Jammed (?); p. pr. & vb. n.
Jamming.] [Either fr. jamb, as if squeezed between
jambs, or more likely from the same source as champ See
Champ.]
1. To press into a close or tight position;
to crowd; to squeeze; to wedge in.
The . . . jammed in between two
rocks.
De Foe.
2. To crush or bruise; as, to jam a
finger in the crack of a door. [Colloq.]
3. (Naut.) To bring (a vessel) so
close to the wind that half her upper sails are laid aback.
W. C. Russell.