with flying colors
“With flying colors” is a saying that is used to explain when something is done with ease and great success.
Sometimes a naval ship or other vessel will sail into a port with many colorful flags (its colors) gloriously flying from its masts. What a thrilling sight! That image was extended to describe people who do something marvelous and spectacularly successful.
Here is an example sentence using the phrase “with flying colors”:
As expected, Catalina passed her SATs with flying colors.