間ㄐㄧㄢˋjiàn不ㄅㄨˋbù容ㄖㄨㄥˊróng髮ㄈㄚˇfǎ

  1. 距離十分相近，中間不能容納一絲毫髮。比喻情勢危急。《文選·枚乘·上書諫吳王》：「係絕於天，不可復結，墜入深淵，難以復出，其出不出，間不容髮。」《五代史平話·唐史·卷下》：「事機之來，急如弩箭，投機之會，間不容髮。」似危如累卵

英(to escape danger etc)​ by a hair's breadth (idiom)​, in a critical state, on the brink of crisis, very close (to happening)​, Taiwan pr. [jian4 bu4 rong2 fa3]