dead axle dead axle /dɛd ˈæksəl/

noun

1. An axle that carries a wheel but without power to drive it  ( dead axle )
   an axle that carries a wheel but without power to drive it
    The rear axle of that trailer is a dead axle; it doesn't provide any power to the wheels.
   The rear axle of that trailer is a dead axle; it doesn't provide any power to the wheels.
   
   

 mothball mothball /ˈmɔθˌbɔl/

noun

1. A small sphere of camphor or naphthalene used to keep moths away from stored clothing  ( camphor ball , mothball )
   a small sphere of camphor or naphthalene used to keep moths away from stored clothing
   
   

verb

1. Put into long-term storage  ( mothball )
   put into long-term storage
   

 Upper Tunguska Upper Tunguska /ˈʌpər tʊnˈgʊskə/

noun

1. A river in southeastern Siberia that flows northwest from Lake Baikal to become a tributary of the Yenisei River  ( Angara , Angara River , Tunguska , Upper Tunguska )
   a river in southeastern Siberia that flows northwest from Lake Baikal to become a tributary of the Yenisei River
   
   

 scaup scaup /skɑːp/

noun

1. Diving ducks of North America having a bluish-grey bill  ( bluebill , broadbill , scaup , scaup duck )
   diving ducks of North America having a bluish-grey bill