(1) Kelly and her sister picked strawberries today. (2) When they arrived home, they decided to make strawberry jam. (3) They had picked so many strawberries that they wouldn't all fit in the pot they had chosen. (4) Kelly got a large spoon and began to jam the strawberries into the pot. (5) Once they were cooked, she then put them into the blender. (6) Her mother warned her not to put too much into the blender because it would cause it to jam. (7) To prevent this from happening, Kelly blended the berries in small batches. (8) Once the berries were blended, they realized how late it was. (9) They asked their mother if she would finish for them so that they could go to the jam session their favorite band was having. (10) She agreed, and they happily left to join their friends.

Choose the meaning of the word jam in sentence 2.