noun
(less common in the US) A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts
(countable) A difficult situation.
(countable) A blockage, congestion, or immobilization.
(countable, popular music) An informal, impromptu performance or rehearsal.
(countable, by extension, informal) A song; a track.
(countable, by extension) An informal event where people brainstorm and collaborate on projects.
(countable, slang) That which one particularly prefers, desires, enjoys, or cares about.
(countable, basketball) A forceful dunk.
(countable, roller derby) A play during which points can be scored.
(countable, climbing) Any of several manoeuvres requiring wedging of an extremity into a tight space.
(Australia) The tree Acacia acuminata, with fruity-smelling hard timber.
(UK, slang) Luck.
(Canada, slang) Balls, bollocks, courage, machismo.
(slang) Sexual relations or the contemplation of them.
(slang) Something enjoyable; a delightful situation or outcome.
verb
To get something stuck, often (though not necessarily) in a confined space.
To brusquely force something into a space; to cram, to squeeze.
To render something unable to move.
To cause congestion or blockage. Often used with "up".
To block or confuse a radio or radar signal by transmitting a more-powerful signal on the same frequency.
(baseball) To throw a pitch at or near the batter's hands.
(basketball) To dunk.
(music) To play music (especially improvisation as a group, or an informal unrehearsed session).
To injure a finger or toe by sudden compression of the digit's tip.
(roller derby) To attempt to score points.
(nautical, transitive) To bring (a vessel) so close to the wind that half her upper sails are laid aback.
(Canada, informal) To give up on a date or some other joint endeavour; to stand up, chicken out, jam out.
(colloquial) To be of high quality (especially for music).
noun
(dated) A kind of frock for children.
noun
(mining) Alternative form of jamb.
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