1
general::
Phrase(s): send in for something [and] send off for something
to dispatch an order for something to a company or other body making a public offer of goods. • I sent in for a new product that is supposed to make my hair grow back. • Did you send in for that country-and-western CD as you said you would? • I sent off for the proper contest entry forms., Phrase(s): send someone in for someone
to send someone into a game as a replacement for someone else. • The coach sent Jill in for Alice, who was beginning to tire. • Ted sent Bill in for Wally.
McGrawhill's American Idioms And Phrasal Verbs