With flying colours
Definition 1 of 1
Pro Tip 1/3Positive Outcome
Use it to describe achieving something in an impressive way, usually more than just satisfying. 
After months of hard work, he won the competition with flying colours.
Pro Tip 2/3Celebratory Tone
It's used to express joy and pride about someone's high achievement, often in public or group settings. 
Our team completed the project with flying colours, and the whole company celebrated.
Pro Tip 3/3Not for Failure
Never used in the context of failure or just getting by; it implies excellence and superior performance. 
He didn't just pass the test; he did it with flying colours.