jam

1. A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts (countable, uncountable) · He is allergic to jam.· She loves eating jam for breakfast in hotels.
2. A difficult situation. (countable)
3. A difficult situation for a pitcher or defending team. (countable) · The pitcher's in a jam now, having walked the bases loaded with the cleanup hitter coming to bat.
4. A blockage, congestion, or immobilization. (countable) · a jam on the 101 South, blocking the two right lanes [radio report]· a jam of logs in a river
5. An informal, impromptu performance or rehearsal. (countable)
6. A song; a track. (countable, informal) · pump up the jam
7. An informal event where people brainstorm and collaborate on projects. (countable) · We came up with some new ideas at the game jam.
8. That which one particularly prefers, desires, enjoys, or cares about. (countable, slang) · Teaching is my jam.

Plural jams