JAM

noun

1. A sweet mixture of fruit boiled with sugar and allowed to congeal. Often spread on bread or toast or used in jam tarts.
2. A difficult situation.
3. Blockage, congestion.

verb

1. To get something stuck in a confined space.
2. To brusquely force something into a space; cram, squeeze.
3. To cause congestion or blockage. Often used with "up"