A blind spot; an area or angle that cannot be seen or is easily overlooked (e.g., a driver's blind spot or a camera blind zone).
バックするときは死角に人がいないか必ず確認すること。
When reversing, always check that there are no people in the blind spots.
大型トラックは死角が多いので小さな車は注意が必要だ。
Large trucks have many blind spots, so small cars need to be careful.
監視カメラの死角を突かれて侵入された。
They broke in exploiting a blind spot in the security cameras.
A dead angle or dead ground; an area out of range of fire or observation (military usage), a sector where weapons or observation cannot reach.
敵の死角をついて奇襲をかけた。
They launched a surprise attack by exploiting the enemy's dead angle.
地形の関係で前方に死角ができている。
Because of the terrain, there is a dead ground in front.