put it down to experience
Okay, so you made a mistake - you just have to put it down to experience and carry on with your life.
There's nothing we can do about it now, we'll just have to put it down to experience.
(Definition of “put it down to experience” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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look like a million dollars
to look or feel extremely good, often because you are wearing something that costs a lot of money