master key

• Ключ, который открывает несколько разных замков, каждый из которых также имеет свой собственный ключ; часто используется метафорически для описания решения или ресурса, который предоставляет доступ ко многим вещам.

A key that opens several different locks, each of which also has its own individual key; often used metaphorically to describe a solution or resource that provides access to many things.

1. Universal keyB1formal

   A key that opens many different locks, typically within a system where each lock also has its own individual key.

   Универсальный ключ

   • The janitor used a master key to open all the classroom doors.
   • Only the manager has the master key to the building.
   • The master key system allows access to restricted areas.

2. Metaphorical solutionB2informal

   Something that provides a solution to many problems or gives access to many things.

   Универсальное решение

   • Education is often called the master key to success.
   • Patience is the master key to resolving conflicts.
   • This software is the master key to unlocking all the data.