the.com/dubbing

means Replacing the original spoken audio of a film or show with a new recording, often in another language, so the lips move but someone else's voice comes out.

from From 'double' — a dubbed track is literally a second (doubled) soundtrack laid over the first. The word arrived via film studios in the early 20th century, when sound cinema created the need to redo or replace audio; the same 'dub' also gives us hip-hop and reggae dubbing, where tracks are likewise layered and remixed rather than recorded fresh.