A flag is a piece of fabric with a distinctive design that is used as a symbol, as a signaling device, or as decoration. The term flag is also used to refer to the graphic design employed by a flag, or to its depiction in another medium.

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  1. A piece of cloth, often decorated with an emblem, used as a visual signal or symbol.
  2. A flag flown by a ship to show the presence on board of the admiral; the admiral himself, or his flagship.
  3. A signal flag.
  4. The use of a flag, especially to indicate the start of a race or other event.
  5. A variable or memory location that stores a true-or-false, yes-or-no value, typically either recording the fact that a certain event has occurred or requesting that a certain optional action take place.
  6. In a command line interface, a notation requesting optional behavior or otherwise modifying the action of the command being invoked.
  7. An abbreviation for capture the flag.

Noun (etymology 2)

  1. Any of various plants with sword-shaped leaves, especially irises; specifically, Iris pseudacorus.

Noun (etymology 3)

  1. A slice of turf; a sod.
  2. A slab of stone; a flagstone, a flat piece of stone used for paving.
  3. Any hard, evenly stratified sandstone, which splits into layers suitable for flagstones.

Noun (etymology 4)

  1. A group of feathers on the lower part of the legs of certain hawks, owls, etc.
  2. A group of elongated wing feathers in certain hawks.
  3. The bushy tail of a dog such as a setter.


  1. To furnish or deck out with flags.
  2. To mark with a flag, especially to indicate the importance of something.
  3. To signal to, especially to stop a passing vehicle etc.
    Please flag down a taxi for me.
  4. To convey (a message) by means of flag signals.
    to flag an order to troops or vessels at a distance
  5. To note, mark or point out for attention.
    I've flagged up the need for further investigation into this.
  6. To signal (an event).
    The compiler flagged three errors.
  7. To set a program variable to true.
    Flag the debug option before running the program.

Verb (etymology 2)

  1. To weaken, become feeble.
    His strength flagged toward the end of the race.
  2. To hang loose without stiffness; to bend down, as flexible bodies; to be loose, yielding, limp.
  3. To let droop; to suffer to fall, or let fall, into feebleness.
    to flag the wings
  4. To enervate; to exhaust the vigour or elasticity of.

Verb (etymology 3)

  1. To lay down flagstones.

The above text is a snippet from Wiktionary: flag
and as such is available under the Creative Commons Attribution/Share-Alike License.

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