⒈  肩并肩，脚尖接脚跟，形容人多拥挤。

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

英cheek-to-jaw; be crowded closely together; crowd against one another; walk shoulder to shoulder and follow in the footsteps of one another;