Zhè chǎng yùndòng dédào le guǎngdà cǎogēn mínzhòng de zhīchí.
This movement received support from the broad grassroots population.
Tips
usage
草根 is a calque (loan translation) of the English 'grassroots'. It entered Chinese as a metaphor for ordinary people with no powerful connections — like grass roots spreading through the earth from the bottom up.
memory
草 = grass + 根 = roots → grass roots, the foundation of society.