jam
n//ˈdʒæːm//sylt, marmelad, knipa, trubbel, propp, stockning, jam, jamma
(less common in the, _, US, &, Canada) 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.
(music) To play music (especially improvisation as a group, or an informal unrehearsed session).