• To hang loose without stiffness; to bend down, as flexible bodies; to be loose, yielding, limp. • To droop; to grow spiritless; to lose vigor; to languish; as, the spirits flag; the streugth flags. • To let droop; to suffer to fall, or let fall, into feebleness; as, to flag the wings. • To enervate; to exhaust the vigor or elasticity of. • That which flags or hangs down loosely. • A cloth usually bearing a device or devices and used to indicate nationality, party, etc., or to give or ask information; -- commonly attached to a staff to be waved by the wind; a standard; a banner; an ensign; the colors; as, the national flag; a military or a naval flag. • A group of feathers on the lower part of the legs of certain hawks, owls, etc. • A group of elongated wing feathers in certain hawks. • The bushy tail of a dog, as of a setter. • To signal to with a flag; as, to flag a train. • To convey, as a message, by means of flag signals; as, to flag an order to troops or vessels at a distance. • An aquatic plant, with long, ensiform leaves, belonging to either of the genera Iris and Acorus. • To furnish or deck out with flags. • A flat stone used for paving. • Any hard, evenly stratified sandstone, which splits into layers suitable for flagstones. • To lay with flags of flat stones.