How did the term yellow come to mean cowardly or shere is streak derived from?

The term "yellow" came to mean cowardly because of its association with jaundice, a liver disease that causes the skin and eyes to turn yellow. In the past, jaundice was often thought to be a sign of a lack of courage or a weak constitution. This association likely arose from the fact that jaundice can cause fatigue, weakness, and a loss of appetite, all of which can make a person seem less energetic and less likely to stand up for themselves.

The phrase "yellow streak" likely derives from the same association between jaundice and cowardice. A yellow streak is a line of yellow running down the back of someone's pants, and it is often used to describe someone who is cowardly or lacking in courage. The phrase implies that the person has a "yellow liver," which is a sign of cowardice.

Here are some other possible explanations for the association between yellow and cowardice:

* The color yellow is often associated with fear and danger. For example, yellow traffic lights mean "slow down and prepare to stop," and yellow caution flags are used in racing to warn drivers of potential hazards.

* Yellow is also the color of pus, which is a sign of infection or disease. In the past, infections and diseases were often thought to be caused by evil spirits or demons, and people who were sick were often seen as being weak or cowardly.

Whatever the reasons, the association between yellow and cowardice is a longstanding one. It is still common today to use the term "yellow" to describe someone who is cowardly or lacking in courage.