In operation; active.
Seeing a steam engine in action is increasingly rare.
After a month in hospital, the reporter is back in action.
In combat.
He was wounded in action in his second tour.
There is nothing more frightful than ignorance in action. Johann Wolfgang von Goethe
Justice is the truth in action. Joseph Joubert
I say that justice is truth in action. Benjamin Disraeli
The aged in council, the young in action. Danish Proverb
Virtue consists in action. Dutch Proverb
Merit consists in action. Latin Proverb