hold the key
US /hoʊld ðə kiː/
UK /hoʊld ðə kiː/

1.
ter a chave, ter a solução
to have the power or control over something; to have the solution to a problem
:
•
The new technology might hold the key to solving the energy crisis.
A nova tecnologia pode ter a chave para resolver a crise energética.
•
The CEO alone holds the key to the company's future decisions.
Apenas o CEO detém a chave para as futuras decisões da empresa.