to treat each other with absolute sincerity and total devotion; often used to describe deep friendship; similar to [[披肝沥胆|披肝瀝膽|pi1 gan1 li4 dan3]]

to treat others with total sincerity and loyalty

to be openhearted and sincere; to show one's loyalty and devotion

to show total sincerity; to be completely honest and open about one's feelings