Zoeken
to hold the key to something
01
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")
Idiom
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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