red flag

bleed red ink

To suffer from severe net losses.

clap one's hands red

To clap or applaud intensely.

cut red tape

To reduce bureaucracy.

flag down

Use a flag or similar kind of signal to get someone's attention.

fly the flag

To support one's country enthusiastically.

freak flag

Unconventional or unrestrained behavior; extreme, nonconformist views; the side of one's personality which harbors a tendency toward such behavior or such views.

Hoover flag

An empty (penniless) pocket, turned inside out, showing that someone has no money (especially during the Great Depression.)

neither fish, flesh, nor good red herring

Synonym of neither fish nor fowl (“not easily categorized; not rightly belonging or fitting well in a given group or situation; also, not having the advantages of the various options”).