MASTER KEY


Meaning of MASTER KEY in English

noun

1. : a key made so that it will open several locks differing somewhat from each other

2. : something of decisive or key importance in the solution of a difficulty, problem, or dispute

one of the master keys to the outcome of the … struggle — Current History

the master key that explained the many mysteries of recent history — Oscar Handlin

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.