open sesame

noun
any marvelously effective means for bringing about a desired result: Wealth is the open sesame to happiness.

Origin:
1785–95; from the use of these words by Ali Baba to open the door of the robbers' den

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World English Dictionary
open sesame
 
n
a very successful means of achieving a result
 
[from the magical words used by Ali Baba in The Arabian Nights' Entertainments to open the door of the robbers' den]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Big figures with the dollar mark before them are the open sesame to social recognition and political preferment.
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