Does it'll all come out in the wash mean it isn't a big deal?

[Nenad11]

English Language Tests, Intermediate level

ESL/EFL Test #324 "English Slang Idioms (45)", question 3

"Don't worry about the bad mark on the quiz, Boris. It's only a small part of your overall grade. It'll all come out in the .........," his instructor said with a wink.

(a) rain
(b) cycle
(c) end
(d) wash

English Language Tests, Intermediate level

ESL/EFL Test #324 "English Slang Idioms (45)", answer 3

"Don't worry about the bad mark on the quiz, Boris. It's only a small part of your overall grade. It'll all come out in the wash," his instructor said with a wink.

Correct answer: (d) wash

Your answer was: incorrect
"Don't worry about the bad mark on the quiz, Boris. It's only a small part of your overall grade. It'll all come out in the end," his instructor said with a wink.
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Does it'll all come out in the wash mean it isn't a big deal?

[Linda]

Yes, it means that the problem will eventually go away/diminish and everything will be OK.
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