寸步 cyun³ bou⁶ {cùn bù}

Tiny step, an inch of step

寸步不離〔---离〕 cyun³ bou⁶ bat¹ lei⁴ {cùn bù bù lí}

to follow somebody closely; to keep close to (idiom)

寸步難行〔--难-〕 cyun³ bou⁶ naan⁴ hang⁴ {cùn bù nán xíng}

1. unable to move a single step (idiom)
2. to be in an (extremely) difficult situation