closed caption
Concise Oxford English Dictionary © 2008 Oxford University Press:
closed caption chiefly N. Amer.
▶noun one of a series of subtitles to a television programme, accessible through a decoder. ▶verb (closed-caption) (usu. as noun closed-captioning) provide (a programme) with closed captions.
– derivatives
closed-captioned adjective.
closed-captioned adjective.
'closed caption' also found in these Oxford entries:

