To describe a dense crowd of people, so many that they are shoulder to shoulder and treading on each other's heels. It signifies a throng or a multitude of people.
节假日期间，热门景点总是游客比肩迭踵，热闹非凡
During holiday periods, popular tourist spots are always packed with visitors, shoulder to shoulder and treading on each other's heels, creating a bustling atmosphere.
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