captionbutton

noun
UK /ˈkæpʃən ˈbʌtən/
US /ˈkæpʃən ˈbʌtən/

A caption button is a small button on a screen that turns words on or off.

I pressed the caption button so I could read what the characters were saying.


OTHER MEANINGS

2. A button that shows or hides the text describing a picture or video.

Tap the caption button to see the photo's description.

3. A control on a video player that displays spoken words as text.

The caption button was easy to find in the corner of the video player.

4. A small on-screen icon that switches subtitles on and off.

She clicked the caption button when the movie got too quiet.