Sentence:  This is followed by a tremendous suck of <WSD>water</WSD> away from the shore as the first great trough arrives . 
Meaning of the word marked with <WSD> tags:  binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent