知ㄓzhī無ㄨˊwú不ㄅㄨˋbù言ㄧㄢˊyán，言ㄧㄢˊyán無ㄨˊwú不ㄅㄨˋbù盡ㄐㄧㄣˋjìn

將所知的全盤說出，毫不保留。宋·蘇洵《衡論上·遠慮》：「聖人之任腹心之臣也，尊之如父師，愛之如兄弟，握手入臥內，同起居寢食。知無不言，言無不盡。」

英not hiding anything he knows, not stopping before he has said it through (idiom), frank, outspoken