1. a piece of cloth with a distinctive design that represents a country, organization, or group
2. a marker or signal used to indicate something

1. to mark or identify something for attention
2. to signal or wave to get someone’s attention
3. to become tired or lose energy

Examples

• The American flag waves proudly in front of the school.
• She placed a red flag on her mailbox to signal the postal worker.
• The teacher will flag any errors in your essay.
• He flagged down a taxi on the busy street.
• After running for an hour, his energy began to flag.
• The referee raised a yellow flag to stop the play.
• Please flag this email as important.
• Her enthusiasm started to flag after the long meeting.