flag

1. flag (noun) — sense 1

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

Example: The vote in the Bundestag (parliament) on Thursday makes defiling foreign flags equal to the crime of defiling the German flag. […] The new law also applies to acts of defilement besides burning, such as publicly ripping a flag up.

2. flag (noun) — sense 2

Definition: The design that could be placed on a flag, typically a rectangular graphic that is used to represent an entity (like a country, organisation or group of people) or an idea.

Example: The flag of France has three vertical stripes.

3. flag (noun) — sense 3

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

4. flag (verb) — sense 4

Definition: To furnish or deck out with flags.

5. flag (verb) — sense 5

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

Example: Walcott was, briefly, awarded a penalty when he was upended in the box but referee Phil Dowd reversed his decision because Bendtner had been flagged offside.

6. flag (verb) — sense 6

Definition: To signal to, especially to stop a passing vehicle etc.

Example: Please flag down a taxi for me.