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Discover Ludwig"the master key" is a correct and usable phrase in written English
You can use it when you want to refer to something that provides access to something else. For example, "The master key unlocked the door to the mysterious room."
Exact(59)
Then I got out the master key.
There are no limitations when the master key is used.
"Our project is about moving the master key away from the laptop, so that the token has the master key," he explained.
But restriction of the franchise was the master key to white supremacy.
On August 8th, rather than turning over the master key, Levison shut down Lavabit.
Employment is the master key to the thriving families that Senator Obama talked about and that are supposed to be the American ideal.
"You have the master key?" This assumed that there could be such an item, which seemed only reasonable, since there was such a thing as Clark.
Mr. Ram has long preached, as he did at the rally, that "political power is the master key with which you can open each and every door".
"The pirates wanted me to go around with the master key -- the one the captain has to unlock any door -- and round up the crew," Blyth recalled.
Privacy and security experts said the breach was akin to stealing the master key for a block of flats, The Intercept said.
Similar(1)
This has been changed and now reads, "The Master-Key to the News".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com