Flagged

To furnish or deck out with flags.

To mark with a flag, especially to indicate the importance of something.

(often with down) To signal to, especially to stop a passing vehicle etc.

"Please flag down a taxi for me."

To convey (a message) by means of flag signals.

"to flag an order to troops or vessels at a distance"

To weaken, become feeble.

"His strength flagged toward the end of the race."

To hang loose without stiffness; to bend down, as flexible bodies; to be loose, yielding, limp.

To let droop; to suffer to fall, or let fall, into feebleness.

"to flag the wings"

To enervate; to exhaust the vigour or elasticity of.

To pave with flagstones.

"Fred is planning to flag his patio this weekend."

Marked with a flag

Registered with a particular country (and thus flying its flag)