How is “split on” used?

In Rounders (1998), one line is: “Wait, wait, wait. Did she split on you?”

Which movie is “split on” from?

The clip at the top of this page is from Rounders (1998).

Wait, wait, wait. Did she split on you?

4 作品で登場 · 1 本目

句動詞

to tell sb in authority about sth wrong, dishonest, etc. that sb else has done

くだけた · イギリス英語 · 4 本の映画に登場

split on sb (to sb)
to tell sb in authority about sth wrong, dishonest, etc. that sb else has done
Don't worry — he won't split on us.

定義：Oxford Advanced Learner's Dictionary 第 9 版