...These freshes deepen the river considerably at that time of the year, and freshen the water many miles from the coast... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Indeed, these, in time, came only to deepen my sorrow...
Frederick Douglass 「My Bondage and My Freedom」
...Then blue tints appear in the firmament which deepen intoazure...
Douglas Dewar 「A Bird Calendar for Northern India」
...As the shadows of each evening gathered around the cottage, the shadowover my life seemed to deepen and grow more gloomy...
Virginia Sharpe Patterson 「Dickey Downy」
...On the other hand,pigments and bases are subject to deoxidation, or to a loss of oxygen,in which case the colour is apt to deepen...
George Field 「Field's Chromatography」
...On the other hand,red appears to deepen in colour rapidly in a declining light as nightcomes on, or in shade...
George Field 「Field's Chromatography」
...Hence you may steer West 3/4 South through thenight, on which course you will very gradually deepen yourwater...
Phillip Parker King 「Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]」
...However, it is evident, that if Captain Lipson continues thesame praiseworthy exertions he has hitherto used, he will deepen the barfor vessels of any tonnage...
Charles Sturt 「Expedition into Central Australia」
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