A Suicide Mission
You do something that’s guaranteed to fail, but you do it because you have to. It's like when your teacher makes you clean the entire school by yourself. Also, when you die in a video game so your team can win. British people love this.
I had to do the presentation in front of the whole class. It was a suicide mission because I had no idea what I was talking about.
I died in the game so my friends could win. It was a suicide mission, and I didn’t even get a medal.
My teacher told me to clean the school. That was a suicide mission, and I almost cried.