jam

A preserve made from whole fruit boiled to a pulp with sugar.

To drive or wedge forcibly into a tight position.

To activate or apply (a brake) suddenly. Often used with on:

To cause (moving parts, for example) to lock into an unworkable position.

To pack (items, for example) to excess; cram.

To fill (a container or space) to overflowing.

To block, congest, or clog.

To crush or bruise.

To interfere with or prevent the clear reception of (broadcast signals) by electronic means.