What does American white hat mean?

White hat is the image of "good guy" in American movies. Decent cowboys always wear white hats, while those villains (robbers, villains, landlords and bullies) appear in black hats.

At first glance, the phrase "white hat" literally means "white hat". In fact, this phrase belongs to a kind of English slang and is often used to mean "good man". In the western United States, good people usually wear white hats and bad people wear black hats, so "white hats" are used to refer to good people, which is equivalent to "good people" or "good people" in English.

In fact, the full name of white day is white day.

It means "white day". This festival originated in Rome in the third century. In February 14, the then Roman emperor saved a couple who were about to be executed for violating the prohibition of love and marriage, and set up Valentine's Day to commemorate this day. A month later, on March 14, the rescued lovers swore to death, so this day was designated as White Day.

Moreover, in English expressions, "white day" also means "auspicious day", for example, white day. (They chose the auspicious day for their engagement.)