noun
EXAMPLES FROM CORPUS
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Guy had proved himself a past master at the art.
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He's a past master at keeping his whereabouts secret, laying false trails.
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Johnny Morris is a past master at both.
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Such a fellow is Colin Fletcher, long-distance trekker, amateur naturalist and past master of great escapes.
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That sort of thing wasn't her style at all, but Susan was a past master at it.
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What they will see is light in the form of an installation by that past master of lux deluxe, Dan Flavin.