send in

Meanings

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