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!
by UrsaLinguistics August 3, 2014
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A person's normal speaking voice, without any change in volume, stress, "tone" or emphasis placed upon any of the words.

Antonym of "upper case voice".
"If you want to continue this discussion, I need you to stop yelling and speak calmly. Use your lower case voice."
by markfromhouston September 25, 2009
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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”
by Sergioservice January 24, 2019
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