Webster's English Dictionary

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quirk

1. quirk \'kw*rk\ \'kw*r-k*-le-\ \-ke--n*s\ \-ke-\ n [origin unknown] 1a: 
   an abrupt twist or curve  1b: a peculiar trait : IDIOSYNCRASY  1c: 
   ACCIDENT, VAGARY  2: a groove separating a bead or other molding from 
   adjoining members  - quirk.i.ly av
2. quirk vt : to give a quirk to to make or exhibit a quirk