(countable, idiomatic, chiefly, US) The source of an education consisting of real-world experiences, especially adverse experiences.
“As if credentials mean nothing lol I certainly wouldn't want to be treated by a doctor whose wall had a degree made in MS Word and said it was from the School of Hard Knocks and did their residency at Google Search Bar. 😒”
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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