What does “put your foot down” mean?

to be very strict in opposing what sb wishes to do

How is “put your foot down” used?

In Mighty Aphrodite (1995), one line is: “Le-- Look, I-- I gotta put my foot down.”

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

Le-- Look, I-- I gotta put my foot down.

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