The process of adding translated or transcribed text at the bottom of movies, TV shows, or videos so people can understand what's being said.
From 'subtitle' (sub- meaning 'under' + title), which combines Latin 'sub' (under) and 'titulus' (inscription). The gerund form '-ing' indicates the ongoing action of creating these captions.
Before streaming made subtitles everywhere, dubbing (overdubbing actors' voices) was how films crossed language barriers—but subtitling lets you hear the original performances and emotions, which is why actors often prefer it!
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