water trough

/W AO1 T ER0 T R AO0 F/
noun
  1. 1

    Used other than figuratively or idiomatically: see water, trough: a watering trough for livestock.

  2. 2

    (rail transport, UK) a long trough placed between the rails in a railway track, which enabled a steam locomotive to replenish its water supply without stopping by lowering a scoop. They were removed at the end of steam train operation.