- 鱼贯而入 yúguàn'érrù to file inTo enter one by one in single file, like a school of fish swimming in a line.
- 鱼贯而出 yúguàn'érchū to file outto walk out in a single line like fish swimming head to tail
- 鱼贯而行 yúguàn'érxíng to walk in single fileto move forward one after another in a continuous line, like fish swimming head to tail
