1. pieces of cloth with distinctive colors or designs used as symbols of countries, organizations, or signals
Usage: plural of flag

1. marks or identifies something for attention or action
Usage: third person singular present
2. signals or waves to get attention
Usage: third person singular present
3. becomes tired or loses energy
Usage: third person singular present

Examples

• The flags of all nations flew at the Olympic ceremony.
• She flags important emails for follow-up.
• The teacher flags down a taxi after school.
• His energy flags by the end of the long workday.
• The colorful flags decorated the festival grounds.
• The system automatically flags suspicious transactions.
• The runner flags the referee to report a foul.