send in

Short definition from Wiktionary

Verb

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