What is "sousings"

Usage examples of "sousings".

I tried to reconcile myself to the belief that it was the high temperature of the tropical regions upon which we are entering, that rendered such extra sousings a necessity, and recalled to my recollection how, during the night of the 13th, I had found the atmosphere below deck so stifling, that in spite of the heavy swell I was obliged to open the porthole of my cabin, on the starboard side, to get a breath of air.