Keep it down to a dull roar informal verb phrase
This phrase is often used in an imperative sentence.
To be quiet or stop making loud noises
Guys, when you do group work, please keep it down to a dull roar.
The kids are sleeping. Keep it down to a dull roar!
The verb "keep" should be conjugated according to its tense.
someone believe that they are allowed to do whatever they want in their own home
It is always advised that wherever you go, a man's home is his castle