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