English Language Learners Stack Exchange is a question and answer site for speakers of other languages learning English. It only takes a minute to sign up.
Sign up to join this community
How to express and action of a person in which he/she tries to move 1 corner of his/her upper lip up high. It could be a smile that you disrespect someone or you give some negative attitude to someone or something. Or you do it when you feel bad about your life, for example, you lost your job or got a divorce.
Is it correct to say "he stretched his lip corner up"?
Both of your images show examples of a grimace:
A contorted facial expression, often expressing contempt or pain.
The noun is to grimace:
To make grimaces; to distort one's face; to make faces.
Grimacing indicates pain or distress, whether one's own or in sympathy with another's. It is usually made by stretching the entire side of one's mouth. If instead you want to indicate disgust you can use the phrase curl one's lip [in disgust], as you discovered. This action generally uses only part of one lip, rather than the whole mouth.
Sources: Kaitlyn on Pinterest, Micro Expressions Training Videos
This is very similar to a sneer, with the difference that "sneer" has the connotation of contempt or scorn while "curl one's lip" has the connotation of disgust.
