Comment by crazygringo

There's definitely an ADR (dubbing) component to movies, but it's not very much these days. (In comparison to decades ago.)

Instead, sound engineers spend weeks cleaning up spoken dialog by hand in spectrogram editors. It's honestly astounding the magic they can do, but it's also labor-intensive and therefore expensive. They're literally individually EQ-ing every vowel, splicing consonants from one word to another... it's wild.