How is “under wraps” used?

In Spotlight (2015), one line is: “all but guarantees that the abuse stays under wraps.”

Which movie is “under wraps” from?

The clip at the top of this page is from Spotlight (2015).

all but guarantees that the abuse stays under wraps.

8 作品で登場 · 1 本目

being kept secret until some time in the future

くだけた · 10 本の映画に登場

オックスフォード映画の 100%
being kept secret until some time in the future
I have implicit trust in you to keep this under wraps.

定義：Oxford Advanced Learner's Dictionary 第 9 版