Meaning of FLAG in English

I. flag 1 /flæɡ/ BrE AmE noun [countable]

[ Sense 1-4: Date: 1500-1600 ; Origin: Perhaps from flag , name of a kind of flower. ]

[ Sense 5: Date: 1400-1500 ; Language: Old Norse ; Origin: flaga ]

1 . a piece of cloth with a coloured pattern or picture on it that represents a country or organization:

Children waving flags greeted the Russian leader.

the flag of Kenya

the Spanish flag

a flag is flying (=a flag is shown on a pole)

Flags were flying at half-mast because of the death of the Premier.

2 . a coloured piece of cloth used in some sports as a signal or as a sign showing the position of something:

The flag went down, and the race began.

a free kick near the corner flag (=flag on a football pitch)

3 . the flag an expression meaning a country or organization and its beliefs, values, and people:

loyalty to the flag

4 . keep the flag flying to achieve success on behalf of your country in a competition:

Bristol kept the flag flying for English rugby with this win.

5 . a ↑ flagstone

⇨ fly the flag at ↑ fly 1 (13)

II. flag 2 BrE AmE verb ( past tense and past participle flagged , present participle flagging )

[ Date: 1500-1600 ; Origin: Origin unknown ]

1 . [transitive] to make a mark against some information to show that it is important:

I’ve flagged the parts I want to comment on.

2 . [intransitive] to become tired or weak:

By the end of the meeting we had begun to flag.

flag somebody/something ↔ down phrasal verb

to make the driver of a vehicle stop by waving at them:

I flagged down a taxi.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.