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to hold the key to something
01
essere la chiave, mano la chiave
to be the determining factor of something, particularly by making its occurrence or success possible
![to [hold] the key to {sth} definition and meaning](https://cdn.langeek.co/photo/44284/original/?type=jpeg "to [hold] the key to {sth} definition and meaning")
IdiomWhat is the origin of the idiom "hold the key to something" and when to use it?
The origin of the idiom "hold the key to something" is not tied to a specific historical event or cultural reference. It is a metaphorical expression that has evolved over time based on the literal concept of keys and their role in unlocking or accessing locked spaces or objects. As language developed, this literal meaning was extended metaphorically to represent knowledge, information, or control that is essential for understanding or resolving a situation. This expression is used when emphasizing the significance of possessing crucial insights or understanding that can influence the outcome or direction of a situation.
Example
The encryption specialist holds the key to decoding the confidential files.
The historian's research holds the key to understanding the origins of ancient civilization.
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