expression
in response; in concert; in coordination
Used when actions or events happen in response to something else, or when multiple parties act together in a coordinated way. Often appears as ～に呼応して.
政府の発表に呼応して、各企業が値下げを始めた。
In response to the government's announcement, various companies began lowering prices.
二つの団体が呼応して抗議活動を行った。
The two groups carried out protest activities in concert.