/ kwɜːk; NAmE kwɜːrk/ noun
1.
an aspect of sb's personality or behaviour that is a little strange
SYN peculiarity
2.
a strange thing that happens, especially by accident :
By a strange quirk of fate they had booked into the same hotel.
► quirky adjective :
a quirky sense of humour
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WORD ORIGIN
early 16th cent. (as a verb): of unknown origin. The early sense of the noun was subtle verbal twist, quibble , later unexpected twist .