1. A discreet or subtle indication or hint given to someone, often implying a suggestion without being direct
He gave me a quiet hint about the surprise party.
Ele me deu uma pista tranquila sobre a festa surpresa.
2. In investigative contexts, a low-key or understated lead or clue
The detective followed a quiet lead that turned out to be crucial.
O detetive seguiu uma pista tranquila que se mostrou crucial.