Trough

1. A long, narrow, generally shallow receptacle for holding water or feed for animals. Any of various similar containers for domestic or industrial use, such as kneading or washing. The cattle feed goes into a trough.
2. A gutter under the eaves of a roof. The trough should be cleared of any leaves that fell there.
3. A long, narrow depression, as between waves or ridges. A linear atmospheric depression associated with a weather front is called a trough.