Definition of gain-up in English:

gain-up

noun

  • A control on a video camera used to increase the gain when filming in dark conditions.

    • ‘This is unlike conventional cameras where the use of electronic gain-up in low light conditions amplifies noise as well as the video signal.’
    • ‘The excellent quality of Canon's optics and the availability of features like gain-up are two of the reasons that I selected Canon over other brands.’

Pronunciation

gain-up

/ˈɡeɪnʌp/