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Vertical blanking interval

duration between the writing of the final row of one frame in a television signal and the writing of the inital row in the next frame, during which the display is allowed to reset and the display head to return to the frame start position

Pronunciation
/ˈvərdəkəl ˈblæŋkɪŋ ˈɪntərvəl/
/ˈvəːtɪkəl blaŋkiŋ ˈɪntəvəl/