Collocations for flag - noun

national | chequered
Schumacher took the chequered flag to win his fourth Grand Prix of the season.

tattered
A tattered flag hung from the roof of the burnt-out building.

fly, hang (out), hoist, raise, run up
a ship flying a Russian flag

lower | wave
The crowd all waved flags as the president came past.

unfurl | carry

hang | flap, flutter, fly, wave
a flag fluttering in the breeze

be/fly at half mast

pole (also ‘flagpole’)

under a/the ~
a ship sailing under a British flag

~ of
a flag of truce