Jam

n. [Of Oriental origin. Cf. Ar. jamad, ice, jelly, pl. of jāmid, congealed, consistent; jamd, congelation, ice.]

1Sense 1. A mass of people crowded together; also, the pressure from a crowd; as, to be in a great jam; to be forced along by the jam.

2Sense 2. A conserve of fruit boiled in mass with sugar and water.

3Sense 3. [Per. & Hind. jāmah, garment, robe.] A kind of frock for children.

4Sense 4. (Mining.) See JAMB, No. 2.

v. t. [imp. & p. p. JAMMED; p. pr. & vb. n. JAMMING.] [Fr. jambe, O. Fr. jame, a leg. See JAMB.] To press; to crowd; to squeeze tight; to wedge in.