n.1. A piece of cloth, usually rectangular, of distinctive color and design, used as a symbol, standard, signal, or emblem.
2. National or other allegiance, as symbolized by a flag: ships of the same flag.
3. A ship carrying the flag of an admiral; a flagship.
4. A marking device, such as a gummed strip of paper, attached to an object to attract attention or ease identification; a tab.
5. The masthead of a newspaper.
6. Music A cross stroke that halves the value of a note to which it is added.
7. A distinctively shaped or marked tail, as of a dog or deer.
8. Computers A variable or memory location that stores true-or-false, yes-or-no information.
tr.v. flagged,
flag·ging,
flags 1. To mark with a flag or flags for identification or ornamentation: flag a parade route; flagging parts of a manuscript for later review.
2. a. To signal with or as if with a flag.
b. To signal to stop: flag down a passing car.