intransitive verb
Definition: To make a facial expression that shows scorn or contempt, often by curling the lip.
Example: He couldn't help but sneer at the ridiculous suggestion.
noun
Definition: A facial expression or remark that shows contempt or scorn, often involving a slight raising of one side of the mouth.
Example: She gave a sneer when she heard his ridiculous suggestion.
transitive verb
Definition: To speak or express something in a way that shows contempt or scorn, often with a mocking tone.
Example: He sneered at the idea, making it clear he thought it was foolish.