Howl down
Definition 1 of 1
Pro Tip 1/3Aggressive Silence
Used when a group actively prevents speaking by loud disapproval, not necessarily physically stopping them. 
The protestors decided to howl down the mayor during the meeting.
Pro Tip 2/3Negative Connotation
'Howl down' often implies an opposed and hostile crowd, suggesting disapproval and rejection. 
Despite his efforts, the audience howled him down.
Pro Tip 3/3Emotional Intensity
The phrase evokes strong emotions, used in situations where feelings run high or debates are heated. 
The shareholders howled down the CEO's proposal in frustration.