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2.
chilling out, not making such a big deal out of things
Dude, it's no big deal, just take it down an octave.
by Akjamin February 01, 2009
 
1.
When used to address someone who is very angry, this phrase generally means "calm down" or "stop screeching" or "stop yelling." It notes that a person raises her voice in both tone and volume when she gets upset.
Sister: I can't believe you read my diary!
Brother: Whoa... Take it down an octave. It's not like I made copies of it for everyone at school. I only made copies for my friends!
by MookieJam10 June 19, 2011