open sesame

(sesə mē′)

  1. magic words spoken to open the door of the thieves' den in the story of Ali Baba in The Arabian Nights
  2. any unfailing means of gaining admission or achieving some other end

See open sesame in American Heritage Dictionary 4

noun
A simple, trusty means of attaining a goal.

Origin:

Origin: From the magical formula Open Sesame used by Ali Baba in the Arabian Nights to open the door of the robbers' cave

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