jam

To jam means to shove in so something gets stuck, to squeeze into a tight space, or is a causal term for playing music. (verb)

Jam means being in an intense or difficult situation, or is a preserve made from whole fruit and sugar. (noun)

See jam in Webster's New World College Dictionary

transitive verb jammed, jamming

to squeeze or wedge into or through a confined space
1. to bruise or crush
2. to force (a thumb, toe, etc.) back against its joint so as to cause impaction
to push, shove, or crowd
to pack full or tight
to fill or block (a passageway, river, etc.) by crowding or squeezing in
1. to wedge or make stick to prevent movement
2. to put out of order by such jamming: to jam a rifle
to make (radio broadcasts, radar signals, etc.) unintelligible, as by sending out other signals on the same wavelength
☆ Basketball, Slang stuff ()

intransitive verb

1. to become wedged or stuck fast
2. to become unworkable through such jamming of parts
to push against one another in a confined space
☆ Informal to improvise freely, esp. in a jam session

noun

a jamming or being jammed
a group of persons or things so close together as to jam a passageway, etc.: a traffic jam
☆ Informal a difficult situation; predicament
☆ Informal jam session
☆ Basketball, Slang stuff ()

noun

a food made by boiling fruit with sugar to a thick mixture

Jamaica

See jam in American Heritage Dictionary 4

(jăm)

verb jammed jammed, jam·ming, jams jams

verb, transitive

To drive or wedge forcibly into a tight position: jammed the cork in the bottle.
To activate or apply (a brake) suddenly. Often used with on: jammed the brakes on.
To cause (moving parts, for example) to lock into an unworkable position: jammed the typewriter keys.
a. To pack (items, for example) to excess; cram: jammed my clothes into the suitcase.
b. To fill (a container or space) to overflowing: I jammed the suitcase with clothes. Fans jammed the hallway after the concert.
To block, congest, or clog: a drain that was jammed by debris.
To crush or bruise: jam a finger.
Electronics To interfere with or prevent the clear reception of (broadcast signals) by electronic means.
Baseball To throw an inside pitch to (a batter), especially to prevent the batter from hitting the ball with the thicker part of the bat.