allegiance
to pledge allegiance to the flag

black
black flag

captain
flag captain

chequered
chequered flag

dip
to dip one's flag

flag
to hoist the flag

flag down
to flag down a taxi

flag-waver
patriota fanático

flag-waving
patriotismo fanático

half-mast
flag at half-mast

haul down
...down one's flag / to haul down one's colours

hoist
to hoist the flag

house
house flag

merchant
merchant flag

national
national flag

put up
to put up a flag

quarantine
quarantine flag

red
red flag

represent
the flag represents the nation

run up
to run up a flag

salute
to salute the flag

sick
sick flag

signal
to signal with a flag

stream
...the Portuguese flag was streaming in the wind

swallowtail
swallowtail flag

sword
sword flag

taxi
to flag down a taxi / to hail a taxi

truce
the flag of truce

white
the white flag