You can use it when you should do something, when you're expected to do that thing.
For example, if you're a student, you can say: "I'm supposed to study this afternoon, but I think I'll play videogames".
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August 5, 2020
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What's the meaning of きみは年をとって死ぬまで、ろくなめにあわないのだ ?
I'm trying to understand the meaning of this sentence: I could get, more or less, the part before the comma but after that everything is dark. ろくな should be "not good" but what are those め and に after it? and what does わないのだ mean?