the MECHANICAL parts of a piano, gun, clock, et cetera or the way the parts move — see also PUMP-ACTION.
Idiom(s) section. actions speak louder than words (saying) what a person actually does means more than what they say they will do in action if somebody/something is in action, they are doing the activity or work that is typical for them: Just press the button to see your favourite character in action; I've yet to see all the players in action. into action if you put an idea or a plan into action, you start making it happen or work: The new plan for traffic control is being put into action on an experimental basis. out of action not able to work or be used because of injury or damage: Jon will be out of action for weeks with a broken leg; The photocopier is out of action today. a piece/slice of the action (informal) a share or role in an interesting or exciting activity, especially in order to make money: Foreign firms will all want a piece of the action if the new airport goes ahead.