plural past masters
: a person who has done something many times before and has become very skilled at doing it : expert
He's a past master at finding ways to get out of trouble.
They are past masters of the art of propaganda.
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“Past master.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/past%20master. Accessed 15 Apr. 2026.
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