fitting the flaps
n.— «Lip Synchronisation, known in America as “fitting the flaps,” is a means of ensuring that the sound of the words being spoken matched the lip movements of the onscreen speaker.» —“Lost in Translation” Schoolgirl Milky Crisis Nov. 27, 2006. (source: Double-Tongued Dictionary)
Further reading
If someone urges you to spill the tea, they probably don’t want you tipping over a hot beverage. Originally, the tea here was the letter T, as in “truth.” To spill the T means to “pass along truthful information.” Plus...
If you speak both German and Spanish, you may find yourself reaching for a German word instead of a Spanish one, and vice versa. This puzzling experience is so common among polyglots that linguists have a name for it. • The best writers create...