a political movement started and driven by ordinary people
普通の人々によって始められ、推進される政治運動 (futsū no hitobito ni yotte hajimerare, suishin sareru seiji undō)
"The campaign grew into a powerful grassroots movement for change."
"そのキャンペーンは、変化のための強力なグラスルーツ運動に成長しました。" (sono kyanpēn wa, henka no tame no kyōryokuna **gurasurūtsu undō** ni seichō shimashita.)
to do something secretly or deceitfully against someone
you shouldn't form an opinion on someone or something based...
to finally understand or accept the truth or a new idea
used to say that something is unlikely to happen
to change direction or strategy quickly
to suddenly think of a good idea