When someone is cowardly, they are said to have what color belly?

The phrase "yellow belly" is often used to describe someone who is cowardly or lacks courage. This expression likely originated from the association of the color yellow with fear or timidity. In various cultures, yellow is sometimes associated with caution, cowardice, or even treachery. The metaphorical use of yellow belly thus signifies someone who lacks bravery or backs down easily when faced with challenges or difficult situations.