one person proposes and a hundred others respond
Definition: One person advocates, and 100 people agree. It describes that there are many people who agree with us. And: echo, echo.
The phrase comes from "Continuing Yi Jian Zhi Hu Gong to the Fox": "In the middle of the night, after the fox chirps, in the garden, one advocate hundred harmony."
The synonym is "one call, one hundred responses"