不敢越雷池一步 [ㄅㄨˋ ㄍㄢˇ ㄩㄝˋ ㄌㄟˊ ㄔˊ ㄧ ㄅㄨˋ; bu4 gan3 yue4 lei2 chi2 yi1 bu4] dare not go one step beyond the prescribed limit ◄ ►