For a general sense of quieting:
* Hush: implies a gentle, calming silence
* Quiet: a straightforward way to say something is becoming silent
* Still: emphasizes the absence of movement or sound
* Muzzle: often used for silencing a person's voice or expression
For a more forceful or oppressive silence:
* Suppress: implies actively stopping something from being heard
* Stifle: suggests a feeling of being choked or held back
* Mute: implies a lack of sound or expression
* Censor: used specifically for silencing communication or information
For a more poetic or literary approach:
* Hush: (as above)
* Subdue: suggests a calming or overpowering of sound
* Quell: implies a forceful silencing of noise or unrest
The best verb to use depends on the specific context and the nuance you want to convey.