show your teeth
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show (one's) teeth
To display an angry, violent, and/or threatening reaction to or against something or someone, as does a dog or wolf when threatened. I will show my teeth to anyone who tries to take away my land. We seemed to be getting along just fine, but she suddenly showed her teeth when I brought up politics.
show your teeth
If a person or organization shows their teeth, they show that they have the power or are able to fight or defend themselves. The financial services authority appears to be showing its teeth. We need to show our teeth if we are going to solve the problems we have been experiencing.