Trough of the sea

the depression between two waves.

See also: Trough

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
My hold had been broken loose, I was under water, and the thought passed through my mind that this was the terrible thing of which I had heard, the being swept in the trough of the sea. My body struck and pounded as it was dashed helplessly along and turned over and over, and when I could hold my breath no longer, I breathed the stinging salt water into my lungs.
This time, as we went into the trough of the sea and were swept, there were no sails to carry away.
But lazily undulating in the trough of the sea, and ever and anon tranquilly spouting his vapory jet, the whale looked like a portly burgher smoking his pipe of a warm afternoon.
Johnson and Alvarez were at my side when, without warning, the bow swung swiftly around and the ship fell into the trough of the sea.
But she strained herself in the trough of the sea, and she shipped a deal of water over her quarter.
Next it veered again so that we had to turn and run with it parallel to the coast to keep from being swamped in the trough of the seas.
The scene was a grand but a fearful one, for our boat fell into the trough of the sea and was rocking fearfully and dragging her anchors out to sea at the rate of ten miles an hour.