動どうと反はん動どう

expression

action and reaction

A set phrase used in physics, philosophy, or metaphorically to describe opposing forces or responses. Often implies a causal chain where every action provokes a corresponding reaction.

• 物ぶつ理り学がくでは、動どうと反はん動どうの法ほう則そくが基き本ほんです。

  In physics, the law of action and reaction is fundamental.

• 彼かれの批ひ判はんは、政せい府ふの政せい策さくに対たいする動どうと反はん動どうの一いち部ぶだった。

  His criticism was part of the action and reaction against the government's policy.