Definition of open sesame in US English:

open sesame

noun

  • A free or unrestricted means of admission or access.

    ‘academic success is not an automatic open sesame to the job market’
    key, path, way, route, avenue, means of access, door, doorway, entry, entrée, admission, admittance
    View synonyms

Origin

Early 18th century: from the magic formula in the tale of Ali Baba and the Forty Thieves (see Ali Baba).

Pronunciation

open sesame

/ˈōpən ˈsesəmē//ˈoʊpən ˈsɛsəmi/