How is “send in” used?

In The Tomorrow War (2021), one line is: “Send in Stevie Nicks.”

Which movie is “send in” from?

The clip at the top of this page is from The Tomorrow War (2021).

Phrasal verb

to order sb to go to a place to deal with a difficult situation; to send sth by post / mail to a place where it will be dealt with

Heard in 766 movies

1
send sb in
to order sb to go to a place to deal with a difficult situation
Troops were sent in to restore order.
2
send sth in
to send sth by post / mail to a place where it will be dealt with
Have you sent in your application yet?

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

Send in Stevie Nicks.

Said in 8 films · #1