FLAG, L. flacceo. See Flaccid. The sense is primarily to bend, or rather to recede, to lag.

1. To hang loose without stiffness to bend down as flexible bodies to be loose and yielding as the flagging sails.
2. To grow spiritless or dejected to droop to grow languid as, the spirits flag.
3. To grow weak to lose vigor as, the strength flags.
4. To become dull or languid.

The pleasures of the town begin to flag.

FLAG, To let fall into feebleness to suffer to drop as, to flag the wings.

FLAG, n. A flat stone, or a pavement of flat stones.