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Are you sure? I have never interpreted it this way and it is the first way I hear this interpretation.

My understanding: To use something "for real" on an actual project, not just toy around with it. (What you use can be good or bad, expression doesn't say)

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My interpretation has always been the same as mceachen's, but other comments in this sub-thread have thought me I am wrong and your understanding is correct. Today I learned.

For what it's worth[0]:

> If you do something in anger, you do it in a real or important situation as it is intended to be done, rather than just learning or hearing about it

[0] https://dictionary.cambridge.org/dictionary/english/in-anger

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