Sisyphus Moment

1. A moment in which a struggle seems to be close to ending, but then goes all the way back to the beginning.

2. Endlessly dying to Sisyphus Prime in ULTRAKILL.

"bro, did you see that leak? they though they patched it, but it just opened up again! they've tried this multiple times already!"
"dude, that's a sisyphus moment right there.