比肩继踵

bǐjiān-jìzhǒng

[cheek-to-jaw; be crowded closely together; crowd against one another; walk shoulder to shoulder and follow in the footsteps of one another] 肩并肩, 脚尖接脚跟, 形容人多拥挤

齐之临淄三百闾, 张袂成阴, 挥汗成雨, 比肩继踵而在, 何为无人?--《晏子春秋·杂下》