How is “in trim” used?

In She Loves Me (2016), one line is: “To trim a tree in?”

Which movie is “in trim” from?

The clip at the top of this page is from She Loves Me (2016).

Modismo

in good condition or order

informal · Se oye en 42 películas

in (good, etc.) trim
in good condition or order
He keeps in trim by running every day.

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

To trim a tree in?

En 8 películas · n.º 1