1. to sulk more persistently or effectively than someone else; to exceed or surpass in sulking
Usage: informal; present participle or gerund form of 'outsulk'

Examples

• The two siblings were outsulking each other after the argument.
• He spent the afternoon outsulking his friend by refusing to speak.
• She was outsulking everyone at the party by sitting alone in the corner.
• They competed in outsulking, each trying to be more withdrawn than the other.
• He couldn't help outsulking his brother whenever they disagreed.