quirk
UK[kwɜːk]US[kwɜːrk]
n
A peculiar behavioral habit or an unusual feature of a person's character.
n
A sudden twist, turn, or curve.
Etymology
The origin of 'quirk' is obscure, first appearing in the early 16th century. It is possibly of Scandinavian or Low German origin, perhaps related to words meaning 'to twist' or 'to coil', which would connect its physical sense of a sudden twist to its abstract meaning of an idiosyncrasy. Another theory suggests it may be an expressive creation, imitative of a quick, twisting motion. Over time, the word's meaning evolved from a literal physical twist to a metaphorical twist in one's behavior or personality, solidifying its modern sense of a peculiar trait.
Analysis
The word 'quirk' is a simplex word of uncertain origin, likely imitative or expressive in nature. It does not break down into meaningful, reusable morphemes within modern English spelling.
Examples
One of his endearing quirks is that he always hums while he works.
The road follows every quirk and bend of the coastline.
By a strange quirk of fate, they ended up living next door to each other years later.