How is “lead off” used?

In Moneyball (2011), one line is: “He's a decent lead-off hitter. He can steal bases.”

Which movie is “lead off” from?

The clip at the top of this page is from Moneyball (2011).

He's a decent lead-off hitter. He can steal bases.

3 作品で登場 · 1 本目

句動詞

to start sth; to start at a place and go away from it

3 本の映画に登場

1
to start sth
Who would like to lead off the debate?
2
lead off (from) sth
to start at a place and go away from it
narrow streets leading off from the main square

定義：Oxford Advanced Learner's Dictionary 第 9 版