show (one's) teeth

show

1. verb, slang To appear or arrive as intended, scheduled, or promised. After an hour of waiting, I realized that my date wasn't going to show. I had an appointment with her this morning, but she didn't show.
2. noun, informal An affair or undertaking. Who's running this show? I want to speak to the person in charge. Well, come on, then. Let's get this show on the road.

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.
See also: show, teeth
Farlex Dictionary of Idioms.

show one's teeth

 and bare one's teeth
Fig. to act in an angry or threatening manner. (Alludes to what an angry wolf or dog does.) We thought Bob was meek and mild, but he really showed his teeth when Jack insulted his girlfriend. The enemy forces didn't expect the country they invaded to bare its teeth.
See also: show, teeth
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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.
See also: show, teeth
Collins COBUILD Idioms Dictionary, 3rd ed.

show your teeth

reveal your strength; be aggressive. British
See also: show, teeth
Farlex Partner Idioms Dictionary

show your ˈteeth

(British English) do something that shows that you are able to act aggressively and use your power in a situation if it is necessary: Up until now the police have been very patient with the strikers, but today they really showed their teeth.
See also: show, teeth
Farlex Partner Idioms Dictionary

show

/bare (one's) teeth
To express a readiness to fight; threaten defiantly.
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
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  • craps