lower your voice 

When someone is being offensive (and/or in a state of anger) and shouts at you you respond with "lower your voice" to tell them you're not alright with their attitude and conversation manner.

Kid: Stop talking about school and grades, Mom! (shouting or speaking loudly)
Mom: Lower your voice!

lower your voice by UrsaLinguistics August 4, 2014

Lower your voice 

When you feel like something someone said is yelling at you, or meant towards you

“People need to stop over using the toilet paper”
“Lower your voice; I didn’t mean to”

Lower your voice by Sergioservice January 23, 2019