This is the 14050th most frequent Polish word.
powierzył
"Powierzył" means "entrusted."
In this sentence, 'powierzył' means 'entrusted,' indicating that Jan let Ali take responsibility for keeping the secret securely.
Jan powierzył Ali tajemnicę.
John entrusted Alice with a secret.
Here, 'powierzył' implies 'assigned responsibility,' showing the director is delegating the project management to the team.
Dyrektor powierzył projekt zespołowi.
The director assigned the project to the team.
In this context, 'powierzyli' means 'entrusted,' referring to the act of giving neighbors the responsibility to watch over the house while the parents were away.