An example of a smirk is the conceited smile you might get after you have just defeated an opponent.
When you give an arrogant smile after defeating your opponent, this is an example of a smirk.
Origin of smirk
- Middle English smirken from Old English smercian to smile smei- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
- Cf. Middle High German smielen/smieren (“to smile") (> obsolete, rare German schmieren).