noun
a person, place, thing, or idea that is involved in the action being described
adverb
modifies a verb, adjective, or another adverb to describe how the action is being performed
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The new security system was put in action to protect the building.
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I love watching superhero movies with all the cool fight scenes in action.
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The dance crew was in action last night at the club, showing off their moves.
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When faced with a difficult decision, it's important to see all the options in action before choosing.