A spoiler is something that ruins or gives away an exciting surprise, like a movie's ending.
When we talk about spoilers, we usually mean they come out of nowhere and ruin our excitement. This can happen on social media, at work, or even with friends who haven't seen the same thing as us. For example, let's say you're getting ready to watch your favorite TV show but a friend texts you the surprise twist that happened last night. That would be a spoiler! Even if it's not on purpose, saying something like "I loved the new movie" when someone is asking what it's about can spoil it for them too.
One who spoils; a plunderer; a pillager; a robber; a despoiler.
To mark (a document or message) with a spoiler warning, to prevent readers from accidentally learning details they would prefer not to know.
