trough trough /ˈtrɔf/

noun

1. () A narrow depression (as in the earth or between ocean waves or in the ocean bed)  ( trough )
   a narrow depression (as in the earth or between ocean waves or in the ocean bed)
     The trough held an abundance of water, providing a lifeline to thirsty animals in the arid desert.
   The trough held an abundance of water, providing a lifeline to thirsty animals in the arid desert.
   
2. () A channel along the eaves or on the roof; collects and carries away rainwater  ( eavestrough [Canadian] , trough , gutter )
   a channel along the eaves or on the roof; collects and carries away rainwater
    The gutter was clogged with leaves and needed to be cleaned
   The gutter was clogged with leaves and needed to be cleaned
   
   
3. A container (usually in a barn or stable) from which cattle or horses feed  ( manger , trough )
   a container (usually in a barn or stable) from which cattle or horses feed
    The pigs gathered around the trough to eat
   The pigs gathered around the trough to eat
   
   
4. A long narrow shallow receptacle  ( trough )
   a long narrow shallow receptacle
   
5. A treasury for government funds  ( public treasury , till , trough )
   a treasury for government funds
   
6. A concave shape with an open top  ( trough , bowl )
   a concave shape with an open top