蚍蜉撼大树 (蚍蜉撼大樹) pífú hàn dàshù

pífú hàn dàshù phrase an ant trying to shake a big tree; to overrate one's own strength
Domain: Proverb 谚语
Notes: Also written 蚍蜉撼树 (CC-CEDICT '蚍蜉撼大樹')