How is “own up” used?

In The Last Picture Show (1971), one line is: “Just didn't have the decency to own up to it.”

Which movie is “own up” from?

The clip at the top of this page is from The Last Picture Show (1971).

to admit that you are responsible for sth bad or wrong

Heard in 3 movies

Oxford100% of films
to admit that you are responsible for sth bad or wrong
Just didn't have the decency to own up to it.
Now we've got a security guard with a skull fracture.

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

Just didn't have the decency to own up to it.

Said in 8 films · #1