How is “chip in” used?

In Black Widow (2021), one line is: “I had to put a chip in the back of her neck.”

Which movie is “chip in” from?

The clip at the top of this page is from Black Widow (2021).

to join in or interrupt a conversation; to add sth to a conversation or discussion

Heard in 6 movies

1
chip in (with sth)
to join in or interrupt a conversation; to add sth to a conversation or discussion
Pete and Anne chipped in with suggestions.
2
chip in (with sth)
to give some money so that a group of people can buy sth together
If everyone chips in we'll be able to buy her a really nice present.

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

I had to put a chip in the back of her neck.

Said in 8 films · #1