Given below is the dictionary meaning of
Smirk: to smile in a silly or unpleasant way that shows that you are pleased with yourself. Look up the dictionary for the following words which are also related to facial expressions and write down the meaning of each
Smile, grin, grimace, sneer
Smile – a pleased, kind, or amused facial expression
Grin – a broad smile
Grimace – an ugly, twisted expression on a person's face, typically expressing disgust, pain or amusement
Sneer – a contemptuous or mocking smile