有隙可乘[yǒu xì kě chéng]
词典there is a crack to squeeze through：有隙可乘。
词典a flaw [chance] for attack
词典there is a loophole to exploit：有隙可乘。
有隙可乘[yǒu xì kě chéng]
there is a crack to squeeze through; a flaw [chance] for attack; there is a loophole to exploit