Coup (noun)

1. A sudden, violent, and illegal seizure of power from a government.
2. A sudden, dramatic, and usually unexpected action or event.
3. A brilliant and successful move or action.

Origin:

From french coup ("stroke, blow"), from old french colp, from latin colaphus ("a cuff, a blo.w")

Examples:

1. The coup was led by a group of military officers.
2. The coup was successful and the dictator was overthrown.
3. The company made a coup by acquiring a major competitor.
4. The athlete pulled off a coup by winning the gold medal.
5. The new product launch was a coup for the company.