[ I/T ] to work or cause something to work, be in action, or have an effect:

[ I ] to cut a body open in order to repair, remove, or replace an unhealthy or damaged part:

[ T ] to use or control equipment or a machine or to make something work:

[ I ] if a business, system, etc. operates in a particular way, it works or is used in that way:

[ I ] to do business in or from a particular place:

[ T ] to manage a business, service, etc. and make it work: