noun
Loanword from English, used in contexts such as broadcasting, gaming, or scheduling to refer to unproductive or idle time.
ラジオの生放送でデッドタイムが発生しないように注意する。
Be careful not to let dead time occur during the live radio broadcast.
ゲームのロード中はデッドタイムだ。
The loading screen in the game is dead time.