verb · to enter a profession or trade, or to associate with a specific group of people

他早已蹑足政界，积累了不少人脉。

verb · to step on someone's foot, often as a secret signal

见他说错了话，旁人赶紧在桌下蹑足示意。

verb · to walk lightly or on tiptoe to avoid making noise

他蹑足潜踪，生怕被人发现。