Learn how to say Troughing correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word trough:
1a long, narrow open container for animals to eat or drink out of:
a water trough
a long, narrow open container used for a purpose such as growing plants.
2a channel used to convey a liquid.
a long hollow in the earth’s surface:
a vast glacial trough
a hollow between two wave crests in the sea.
3an elongated region of low barometric pressure.
4a point of low activity or achievement:
seasonal peaks and troughs in the demand for goods and services
Mathematics a region around the minimum on a curve of variation of a quantity.
[no object] informal
Old English trog, of Germanic origin; related to Dutch trog and German Trog, also to tree