buck-toothed       
adjective uk/ˌbʌkˈtuːθt/ us/ˌbʌkˈtuːθt/
 龅牙的
having upper front teeth that stick out
  His young neighbour is a sweet, buck-toothed kid. 他的年轻邻居是一个可爱的龅牙孩子。 
 Two buck-toothed pet bunnies are kept in a hutch in the garden. 两只龅牙的宠物兔被养在花园的一个小屋里。 
 See: buck teeth
 - More examples
 - He has angelic features and a shy, buck-toothed smile.
 - The population of these buck-toothed beavers has increased dramatically.
 - She’d always been slightly buck-toothed.