间不容发

词典解释

(1) [a seamless heavenly robe——flawless;by the skin of one's teeth;by a hair's breadth;the difference is as narrow as a hair's breadth]∶中间放置不下一根头发,形容相距极微

律厤迭相治,其间不容发。——《大戴礼记》

(2) [the situation is extremely critical;within a hair of;within an inch of]∶比喻情势危急到极点

其出不出,间不容发。——汉· 枚乘《上书谏吴王》

成语解释

间：空隙。空隙中容不下一根头发。比喻情势非常危急。也指严谨完整；没有破绽。