How is “force of habit” used?

In Suddenly, Last Summer (1959), one line is: “I almost said, "You must meet my son Sebastian." Force of habit.”

Which movie is “force of habit” from?

The clip at the top of this page is from Suddenly, Last Summer (1959).

I almost said, "You must meet my son Sebastian." Force of habit.

8 作品で登場 · 1 本目

if you do sth from or out of force of habit, you do it automatically and in a particular way because you have always done it that way in the past

10 本の映画に登場

オックスフォード映画の 100%
if you do sth from or out of force of habit, you do it automatically and in a particular way because you have always done it that way in the past
Then it was only force of habit.
It's a force of habit. You don't mind if I look around, do you?

定義：Oxford Advanced Learner's Dictionary 第 9 版