What is "to drown up"

Drown \Drown\, v. t.

1. To overwhelm in water; to submerge; to inundate. ``They drown the land.''
   --Dryden.

2. To deprive of life by immersion in water or other liquid.

3. To overpower; to overcome; to extinguish; -- said especially of sound.

   Most men being in sensual pleasures drowned.
   --Sir J. Davies.

   My private voice is drowned amid the senate.
   --Addison.

   To drown up, to swallow up. [Obs.]
   --Holland.