Definition & Meaning of "mither"in English

What does "to mither" mean in British dialectal slang?

It is used in British English, particularly in Northern England (especially Yorkshire, Lancashire, and Manchester) and the Midlands, to mean to bother, annoy, or pester someone, often with persistent questions or complaints. People typically say "Stop mithering me" or "The kids have been mithering all day." The term originated in 19th century Northern English dialect, and remains a common regional word, though less known in Southern England.