The idiom "in action" originated in the military, specifically during World War I, when soldiers were sent to the front lines to fight. It was used to describe soldiers who were actively engaged in combat and carrying out their training. It is often used to describe situations where someone is performing a task or activity that they are trained for or skilled at.

What is the origin of the idiom "in action" and when to use it?

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Визначення та значення слова «in action» англійською мовою

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