<p><strong>Noun:</strong></p><ul><li>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.</li><li>Ornithology: The tuft of long feathers on the legs of falcons and most hawks; the lengthened feathers on the crus or tibia.</li><li>Hunting: The tail of a deer or of a setter dog.</li><li>Journalism: The nameplate of a newspaper.</li><li>A tab or tag attached to a page, file card, etc., to mark it for attention.</li><li>A decrease in activity, as in business or work: A sudden slack in output.</li><li>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.</li></ul><p><strong>Verb (used with object):</strong></p><ul><li>To place a flag or flags over or on; decorate with flags.</li><li>To signal or warn (a person, automobile, etc.) with or as if with a flag (sometimes followed by down): To flag a taxi; to flag down a passing car.</li><li>To mark (a page in a book, file card, etc.) for attention, as by attaching protruding tabs.</li></ul>