Present participle of quiet, meaning to make or become quiet.

चुप करना

English Usage: She was quietening her baby with a lullaby.

Hindi Usage: उसने अपने बच्चे को लोरी गा कर चुप कराया।

The act of making something quiet or tranquil.

शांति लाना

English Usage: The quietening of the crowd made it easier for the speaker to be heard.

Hindi Usage: भीड़ का शांति लाना वक्ता को सुनना आसान बना।