Definitions for: Jam


[n] deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems
[n] preserve of crushed fruit
[n] a dense crowd of people
[n] informal terms for a difficult situation; "he got into a terrible fix"; "he made a muddle of his marriage"
[v] interfere with or prevent the reception of signals; "Jam the Voice of America"; "block the signals emitted by this station"
[v] eat until one is sated; "He filled up on turkey"
[v] block passage through; "obstruct the path"
[v] crush or bruise; "jam a toe"
[v] crowd or pack to capacity; "the theater was jampacked"
[v] get stuck and immobilized; "the mechanism jammed"
[v] push forcibly, as of brakes; "The driver jammed the brake pedal to the floor"
[v] press tightly together or cram; "The crowd packed the auditorium"



Webster (1913) Definition: Jam, n. [Per. or Hind. j[=a]mah 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.


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, j[=a]mid 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.

Synonyms: block, block, chock up, close up, cram, cram, crush, crush, electronic jamming, fill, fill up, fix, hole, impede, jamming, jampack, kettle of fish, mess, mob, muddle, obstruct, obturate, occlude, pack, pack, pickle, pile, press, ram, stuff, throng, wad

Antonyms: disengage, free

See Also: asphyxiate, back up, bar, barrage jamming, barricade, barricado, binge, block off, block out, block up, blockade, break up, bruise, choke, choke off, clog, clog up, congest, conserve, conserves, contuse, crowd, crowd, crowd together, cut off, dam, dam up, difficulty, disrupt, dog's breakfast, dog's dinner, earth up, ECM, electronic countermeasures, englut, engorge, force, foul, glut, gorge, gormandise, gormandize, gourmandize, hinder, ingurgitate, interrupt, land up, malfunction, misfunction, overeat, overgorge, overindulge, pig out, preserve, preserves, push, satiate, scarf out, screen, selective jamming, snarl-up, spot jamming, strawberry jam, strawberry preserves, stuff, suffocate, tie up, traffic jam

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