Wilson's Dictionary of Bible Types
Psalm 69:2 (b) This is a Messianic Psalm about the Saviour, but no doubt it also expresses David's feelings about himself when he was in deep trouble. There was none to help in the time of need, and there seemed to be no bottom to the depths of sorrow. This figure is used to describe his feelings at the time of his deep distress.
Luke 9:44 (b) The Saviour is describing in this way the fact that He wanted those who heard Him to accept His words, apply them to their hearts, and let them be permanently impressed upon the mind.
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Watson, Walter. Entry for 'Sink'. Wilson's Dictoinary of Bible Types. https://www.studylight.org/dictionaries/eng/wdt/s/sink.html. 1957.