A flag is a piece of cloth that represents a country, group, or institution. If you're particularly proud of your Irish heritage, you might fly an Irish flag in your front yard.

A real flag enthusiast might fly the American flag, their state flag, their city's flag, and the flag of their parents' birth countries. There are also flags used for signaling on ships at sea and during races and sporting events, and flags that represent armies or advertise products. When flag is used as a verb, it means "to lose energy or enthusiasm." When students start to flag in the afternoon, they tend to take a quick nap — sitting up at their desks.

Definitions of flag
  1. noun
    emblem usually consisting of a rectangular piece of cloth of distinctive design
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    American flag, Old Glory, Star-Spangled Banner, Stars and Stripes
    the national flag of the United States of America
    banner, streamer
    long strip of cloth or paper used for decoration or advertising
    battle flag
    a flag that leads troops into battle
    Jolly Roger, black flag, blackjack, pirate flag
    a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship
    colors, colours
    a flag that shows its nationality
    a small flag used by surveyors or soldiers to mark a position
    small flag indicating a ship's nationality
    pennant, pennon, streamer, waft
    a long flag; often tapering
    banner, standard
    any distinctive flag
    Confederate flag, Stars and Bars
    the first flag of the Confederate States of America
    tricolor, tricolour
    a flag having three colored stripes (especially the French flag)
    Union Jack, Union flag
    national flag of the United Kingdom
    flag of truce, white flag
    flag consisting of a piece of white cloth that is hoisted to signal surrender or to ask for a truce
    yellow jack
    yellow flag hoist on a ship in quarantine
    ensign, national flag
    an emblem flown as a symbol of nationality
    colors flown by a ship to show its nationality
    a red or orange-red flag used as a standard by early French kings
    pennoncel, pennoncelle, penoncel
    a small pennant borne on a lance
    type of:
    emblem, icon
    special design or visual object representing a quality, type, group, etc.
  2. noun
    a rectangular piece of fabric used as a signalling device
    synonyms: signal flag
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    a flag longer than it is wide (and often tapering)
    code flag, nautical signal flag
    one of an international code of flag signals used between ships
    red flag
    a flag that serves as a warning signal
    blue peter
    a blue flag with a white square in the center indicates that the vessel is ready to sail
    type of:
    visual signal
    a signal that involves visual communication
  3. noun
    flagpole used to mark the position of the hole on a golf green
    synonyms: pin
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    type of:
    golf equipment
    sports equipment used in playing golf
  4. verb
    provide with a flag
    Flag this file so that I can recognize it immediately”
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    type of:
    make or leave a mark on
  5. verb
    communicate or signal with a flag
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    type of:
    sign, signal, signalise, signalize
    communicate silently and non-verbally by signals or signs
  6. verb
    decorate with flags
    “the building was flagged for the holiday”
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    type of:
    adorn, beautify, decorate, embellish, grace, ornament
    make more attractive by adding ornament, colour, etc.
  7. noun
    a listing printed in all issues of a newspaper or magazine (usually on the editorial page) that gives the name of the publication and the names of the editorial staff, etc.
    synonyms: masthead
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    type of:
    list, listing
    a database containing an ordered array of items (names or topics)
  8. noun
    plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
    synonyms: fleur-de-lis, iris, sword lily
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    bearded iris
    any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals)
    beardless iris
    any of numerous wild or cultivated irises having no hairs on the drooping sepals (the falls)
    bulbous iris
    any of various irises having a rootstock formed like a bulb
    Iris cristata, dwarf iris
    low-growing summer-flowering iris of northeastern United States
    Iris foetidissima, gladdon, gladdon iris, roast beef plant, stinking gladwyn, stinking iris
    iris with purple flowers and foul-smelling leaves; southern and western Europe and North Africa
    Iris persica, Persian iris
    bulbous iris native to Asia Minor cultivated for its pale lilac-colored flowers
    Iris pseudacorus, yellow flag, yellow iris, yellow water flag
    common yellow-flowered iris of Europe and North Africa, naturalized in United States and often cultivated
    Iris verna, dwarf iris, vernal iris
    low-growing spring-flowering American iris with bright blue-lilac flowers
    Iris versicolor, blue flag
    a common iris of the eastern United States having blue or blue-violet flowers; root formerly used medicinally
    Iris virginica, southern blue flag
    similar to blue flag; the eastern United States
    English iris, Iris xiphioides
    bulbous iris native to the Pyrenees; widely cultivated for its large delicate flowers in various colors except yellow
    Dutch iris, Iris filifolia
    bulbous Spanish iris with red-violet flowers
    Florentine iris, Iris florentina, Iris germanica florentina, orris
    German iris having large white flowers with lavender-tinged falls and a fragrant rhizome
    German iris, Iris germanica
    a large iris with purple or white flowers, native to central and southern Europe
    Iris kaempferi, Japanese iris
    iris native to Japan having large showy flowers
    German iris, Iris kochii
    iris of northern Italy having deep blue-purple flowers; similar to but smaller than Iris germanica
    Dalmatian iris, Iris pallida
    European iris having soft lilac-blue flowers
    Dutch iris, Iris tingitana
    bulbous Spanish iris having blue flowers
    Iris xiphium, Spanish iris, xiphium iris
    bulbous iris of western Mediterranean region having usually violet-purple flowers
    type of:
    iridaceous plant
    any bulbous plant of the family Iridaceae
  9. noun
    stratified stone that splits into pieces suitable as paving stones
    synonyms: flagstone
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    type of:
    paving stone
    a stone used for paving
  10. noun
    a conspicuously marked or shaped tail
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    type of:
    the posterior part of the body of a vertebrate especially when elongated and extending beyond the trunk or main part of the body
  11. verb
    droop, sink, or settle from or as if from pressure or loss of tautness
    synonyms: droop, sag, swag
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    slouch, slump
    assume a drooping posture or carriage
    hang loosely, like an empty bag
    type of:
    drop, drop down, sink
    fall or descend to a lower place or level
  12. verb
    weaken or become less intense
    synonyms: ease off, ease up, slacken off
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    type of:
    decrease, diminish, fall, lessen
    decrease in size, extent, or range
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