jīn gōng zì fá
以为功高而自我夸耀
《晋书 陆机传》:“冏既矜功自伐,受爵不让,机恶之,作《豪士赋》以刺焉。”
矜功自伐兼语式;作谓语;含贬义,指自以为有功劳而夸耀。
claim credit for oneself and become arrogant