Definition of muggle in English:

muggle

noun

informal
  • A person who is not conversant with a particular activity or skill.

    ‘she's a muggle: no IT background, understanding, or aptitude at all’
    • ‘This is absolutely typical of the tourist authorities, who are behaving like a bunch of muggles.’
    • ‘A neat spin on the driving test we muggles take as we ‘come of age’.’
    • ‘She will, but also thinks they will know nothing since they are both muggle dentists.’

Origin

1990s: from mug + -le; used in the Harry Potter books by J. K. Rowling to mean ‘a person without magical powers’.

Pronunciation

muggle

/ˈmʌɡ(ə)l/