Definition & Meaning of "Dutch uncle"

What is the origin of the idiom "Dutch uncle" and when to use it?

The origin of the idiom "Dutch uncle" is uncertain, but it dates back to the 19th century in Britain. This phrase is used for giving direct and stern advice, akin to a strict family member. It should be used carefully in appropriate situations, aiming to provide constructive feedback and promote personal growth rather than being overly critical.