What does “get off the ground” mean?

to start happening successfully; to make sth start happening successfully

How is “get off the ground” used?

In Mighty Aphrodite (1995), one line is: “and I know that's a sore point, but, you know, it'll be only 'til it gets off the ground.”

The clip at the top of this page is from Mighty Aphrodite (1995).

and I know that's a sore point, but, you know, it'll be only 'til it gets off the ground.

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