不敢越雷池一步

bù gǎn yuè léi chí yī bù

dare not go one step beyond the prescribed limit

不

bù

no; not so

敢

gǎn

to dare

越

yuè

generic word for peoples or states of south China or south Asia at different historical periods

雷

léi

thunder

池

chí

pond

一

yī

one

步

bù

a step