腹心之友 fùxīnzhīyǒu bosom friend Origin Definitions Defs Strokes Stroke Words Sentences Sents 腹心 fùxīn innermost feelings one's true thoughts or most sincere feelings, as in the phrase 披腹心 pīfùxīn之 zhī particle [possessive] Connects a describing word or phrase to the noun it describes, similar to 的 de but used in formal or literary writing.友 yǒu noun friend (bound form) friend; companion; associate; partner