past master

  1. a person who formerly held the position of master, as in a lodge or club
  2. Origin: for passed master

    a person who has had long experience in some occupation, art, etc.; expert

See past master in American Heritage Dictionary 4

noun
  1. One who has formerly held the position of master in an organization, especially a social one such as a lodge or club.
  2. One who is thoroughly experienced and skilled in a particular craft or activity.

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