make (one’s) bones
 v.— «Shah is a 41-year-old publisher of small provincial newspapers who made his bones after winning a bitter strike against the unions that tried to shut down his northern England operation when he brought in computers and offset presses three years ago.» —“Murdoch Challenging British Unions” by Timothy Harper Dallas Morning News (Texas) Feb. 24, 1986. (source: Double-Tongued Dictionary)

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