A sweet spread or preserve made from fruit and sugar, often used on bread or toast. She spread strawberry jam on her toast for breakfast.
A situation in which something becomes stuck or blocked, preventing movement or progress. There was a traffic jam on the highway, causing delays for commuters.
A gathering or session where musicians play music together informally. The local musicians held a jam at the community center every Friday night.
Informal: a difficult or awkward situation; a predicament. He found himself in a jam when he lost his wallet.
Slang: something that one particularly likes, excels at, or enjoys doing. Digital illustration is her jam; she spends hours perfecting her artwork.