Protest march and Sit-down

Protest march noun - Occasion when you can express opposition by marching (usually on some government institution) without a license.

Sit-down and protest march are semantically related. In some cases you can use "Sit-down" instead a noun phrase "Protest march".

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

Protest march and sit-down are semantically related. You can use "Protest march" instead a noun phrase "Sit-down".