Rally (verb)

1. To gather together for a common purpose.
2. To come or bring together in support of a person, cause, or organization.
3. To recover strength or spirits after a setback.

Origin:

From middle english rallien, from old french rallier, from re- + alyer ("to bind to, ally").

Examples:

1. The community rallied together to help the victims of the disaster.
2. The team rallied in the final minutes to win the game.
3. The stock market rallied after a period of decline.
4. The soldiers rallied around their leader.
5. The citizens rallied in support of the new laws.