1. a sport played on horseback by two teams of four players who use long-handled mallets to hit a ball through goalposts
2. a casual shirt with a collar and a few buttons at the neck
3. water polo, a team sport played in a swimming pool

Examples

• The polo match was held at the country club.
• He learned to play polo during his summer in Argentina.
• She wore a navy blue polo to the golf tournament.
• The polo shirt is perfect for casual Friday at work.
• The university’s water polo team won the championship.
• Polo requires excellent horsemanship and hand-eye coordination.
• He packed several polo shirts for his vacation.