[flag] 
noun, verb, flagged, flag⋅ging.| 1. | a piece of cloth, varying in size, shape, color, and design, usually attached at one edge to a staff or cord, and used as the symbol of a nation, state, or organization, as a means of signaling, etc.; ensign; standard; banner; pennant. |
| 2. | Ornithology. the tuft of long feathers on the legs of falcons and most hawks; the lengthened feathers on the crus or tibia. |
| 3. | Hunting. the tail of a deer or of a setter dog. |
| 4. | Journalism.
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| 5. | a tab or tag attached to a page, file card, etc., to mark it for attention. |
| 6. | Music. hook (def. 12a). |
| 7. | Movies, Television. a small gobo. |
| 8. | Usually, flags. the ends of the bristles of a brush, esp. a paintbrush, when split. |
| 9. | Computers. a symbol, value, or other means of identifying data of interest, or of informing later parts of a program what conditions earlier parts have encountered. |
| 10. | to place a flag or flags over or on; decorate with flags. |
| 11. | to signal or warn (a person, automobile, etc.) with or as if with a flag (sometimes fol. by down): to flag a taxi; to flag down a passing car. |
| 12. | to communicate (information) by or as if by a flag. |
| 13. | to decoy, as game, by waving a flag or the like to excite attention or curiosity. |
| 14. | to mark (a page in a book, file card, etc.) for attention, as by attaching protruding tabs. |
| 15. | (of a brush) to split the ends of the bristles. |
| 16. | strike the flag,
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flag
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flag down
Signal to stop, as in The police were flagging down all cars. This expression uses the verb flag in the sense of "catch the attention of, as by waving a flag," a usage dating from the mid-1800s; down was added in the first half of the 1900s.
