bare teeth

To display an angry, violent, or threatening reaction to or against something or someone, as does a dog or wolf when threatened. I will bare my teeth to anyone who tries to take away my land. We seemed to be getting along just fine, but she suddenly bared her teeth when I brought up religion.
برخی جانوران مانند گرگ ، شیر و . . . برای نشان دادن دشمنی و یا ترساندن، دندان هاشون رو نشون میدن که به این کار میگن bare teeth

به نشانه آماده نزاع یا نبرد شدن
His refusal to accept my offer made it clear I'd have to bare my teeth