serve

verb:to perform duties or services for a person, organization, or country
- She chose to serve in the military for five years.
verb:to present food or drink to someone
- The waiter will serve our meals shortly.
verb:to be useful or beneficial; to fulfill a purpose
- This tool will serve many functions in the workshop.
verb:to spend a period of time in prison
- He will serve ten years in prison for his crime.
verb:to start play in tennis, volleyball, or other sports by hitting the ball
- It's your turn to serve for the match point.