Ronda Rousey to Correia -- DEATH STARE ... In Sequin Crop Top

It's hard to look like a badass in a sparkly half shirt -- but Ronda Rousey pulled it off ... giving the LOOK OF DEATH to Bethe Correia today during the staredown for UFC 190 in Brazil.

These women HATE each other -- and as Ronda told us earlier this week, she doesn't just want to beat Correia, she wants to HURT HER AS BADLY AS POSSIBLE.

You can see in the video, Bethe tries to talk trash to Ronda -- but Rousey don't care.

As for what Bethe said, a UFC rep says Correia spoke in Portugese -- but it translates to, "Come face me. I’m going to knock you out."