send in

verb5

1. •
   To cause (something) to be delivered, especially by post/mail.
2. •
   To send (someone) into the thick of things.
3. •
   To send (troops) into battle.
4. •
   To send (a batsman) onto the field to bat.
5. •
   (historical) To give (one's name), present (one's card) when making a social call.