How is “stack up” used?

In Spotlight (2015), one line is: “It just feels like this thing's stacking up. It's my gut.”

Which movie is “stack up” from?

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

It just feels like this thing's stacking up. It's my gut.

6 作品で登場 · 1 本目

to keep increasing in quantity until there is a large pile, a long line, etc.

5 本の映画に登場

1
to keep increasing in quantity until there is a large pile, a long line, etc.
Cars quickly stacked up behind the bus.
2
to compare with sb / sth else; to be as good as sb / sth else
Let's try him in the job and see how he stacks up.
3
to seem reasonable; to make sense
That can't be right. It just doesn't stack up.

定義：Oxford Advanced Learner's Dictionary 第 9 版