A quirk of fate.
A quirk of the head.
He quirked an eyebrow.
The corners of her mouth quirked.
When a strange twist of fate leads you to bump into your old high school sweetheart and you end up getting married, this is an example of a quirk of fate.
When you have to do something sort of odd, like spin around twice before sitting in your chair, this is an example of a behavioral quirk.
Origin of quirk
- Origin unknown
From American Heritage Dictionary of the English Language, 5th Edition
- First attested in the 1540s. Of uncertain origin.