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

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