摩肩接踵

mójiānjiēzhǒng
  1. lit. rubbing shoulders and following in each other's footsteps
  2. a thronging crowd

CEDICT

to be crowded; to be filled with people.

Wiktionary

踵，腳跟。摩肩接踵指肩摩肩，腳碰腳。形容人多擁擠不堪。也作「肩摩踵接」、「踵接肩摩」。

重編國語辭典

Entry Composition

1 摩 mó to rub
2 肩 jiān
  1. shoulder
  2. to shoulder (responsibilities etc)
3 接踵 jiēzhǒng to follow on sb's heels