send into

send someone into something

 and send someone in
to make someone go into something or some place. George sent me into the house for a hammer. The boys know where it is. He should have sent in the boys. George sent me in.
See also: send

send something into something

 and send something in
to dispatch something, such as an order, to a company or other body making a public offer of goods. I sent the order in to the home office. I sent in the order.
See also: send