Jam and Sit-down

Jam noun - A crowded mass (as of cars) that impedes or blocks movement.

Sit-down and jam are semantically related In some cases you can use "Sit-down" instead a noun "Jam".

Nearby Word: jamming

Sit-down noun - A strike in which workers refuse to leave the workplace until a settlement is reached.

Jam and sit-down are semantically related in stoppage topic. Sometimes you can use "Jam" instead a noun phrase "Sit-down".