蹑脚

蹑脚	niè jiǎo	to walk cautiously in order not to make noise
蹑	niè	to walk on tiptoe / to walk quietly / to tread (on) / to follow
脚	jiǎo	foot / leg (of an animal or an object) / base (of an object) / CL:双,只 / classifier for kicks
脚	jué	role (variant of 角)