"Stuck one lip out" is a gesture often used to convey displeasure or disapproval. If you're looking for synonyms for this phrase, consider "pout," "sulk," or "grimace." "Pout" suggests a petulant expression, while "sulk" connotes a withdrawn attitude. "Grimace" implies a facial expression that conveys physical discomfort or pain. Other synonyms include "frown," "scowl," and "pucker," all of which encompass a similar expression of displeasure. Whether you're trying to describe a child's tantrum or a co-worker's response to criticism, these synonyms can help you capture the emotions conveyed by "stuck one lip out".