摸石頭過河 [ㄇㄛ ㄕˊ ˙ㄊㄡ ㄍㄨㄛˋ ㄏㄜˊ; mo1 shi2 tou5 guo4 he2] lit. crossing the river by feeling for stones improvise by trial-and-error move cautiously ◄ ►