1. to work for or help someone
2. to provide food or drinks to someone
3. to be useful or adequate for a purpose

Examples

• She serves customers at the restaurant every evening.
• The waiter serves dinner at seven o’clock.
• This old computer still serves our basic needs.
• He serves the ball with great power in tennis.
• The soldier serves his country with honor.
• She serves on the school board as treasurer.
• This recipe serves four people.