To praise a person before everybody; to speak on someone's behalf or intercede for someone; derived from a Tang Dynasty story where Yang Jingzhi frequently praised the talent of Xiang Si to others

To put in a good word for someone or speak on their behalf; to intercede. This phrase originates from the story of a poet named [[项斯|項斯|xiang4 si1]] in the Tang Dynasty, whose reputation was spread by others who praised his work everywhere they went.