bare one's teeth 

to reveal the true nature or colors completely. to reveal the ugly side of human nature.

People in Dogville bare their teeth. (bare one's teeth: change the word form when necessary.)

bare one's teeth by Leila Lee January 15, 2007

bare one’s teeth 

to behave aggressively towards somebody; to vent anger on somebody; to scold.

Whenever there was a tiff between the husband and his wife, the wife, being a termagant, would bare her teeth. (In the phrase ‘bare one’s teeth, one’s can be replaced by an appropriate pronoun as required.)

bare one’s teeth by uttam maharjan November 3, 2011