Hissing is a sound made by humans and animals to express displeasure or disapproval. Evince displeasure is an expression that means to show or demonstrate displeasure, often through facial expressions, body language, or vocalizations such as hissing. Therefore, the crossword solution of 'HISS' for the term 'evince displeasure' is appropriate, as it is a sound that is commonly used to express displeasure.