noun

1. A piece of cloth, often decorated with an emblem, used as a visual signal or symbol.

2. An exact representation of a flag (for example: a digital one used in websites).

3. A flag flown by a ship to show the presence on board of the admiral; the admiral himself, or his flagship.

Synonyms: option, switch, Boolean, dart

verb

1. To furnish or deck out with flags.

2. To mark with a flag, especially to indicate the importance of something.

3. (often with down) To signal to, especially to stop a passing vehicle etc.

   “Please flag down a taxi for me.”