芋の子を洗うよう
Meanings
1
jam-packed; teeming; heaving with people
Idiomatic simile describing a crowd so dense that people are jostling against each other, like potatoes being washed in a tub. Often used with 混雑, 人混み, or similar words.
See also: 芋を洗うよう
The summer festival venue was jam-packed with people jostling against one another.
The rush-hour train is exactly like a scene of people jostling together.