IPA: /kwɜrk/
KK: /kwɜrk/
A unique or unusual characteristic or behavior that makes someone or something different from others.
Her quirk of always wearing mismatched socks makes her stand out in a crowd.
Quirk originates from the Middle English word 'quirke', meaning a twist or a quirk, which is of uncertain origin but may be related to the Scottish word 'quirk', meaning a twist or turn. The word describes an unusual or peculiar trait or behavior.
Think of a 'twist' or 'turn' in someone's behavior — that's what a quirk refers to, an unusual or peculiar trait.