rock bottom

noun
the very lowest level: He went bankrupt and touched rock bottom.

Origin:
1865–70, Americanism

Dictionary.com Unabridged

rock-bottom

[rok-bot-uhm]
adjective
at the lowest possible limit or level; extremely low: rock-bottom prices.

Origin:
1880–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To rock-bottom
Collins
World English Dictionary
rock bottom
 
n
a.  the lowest possible level
 b.  (as modifier): rock-bottom prices

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
And by putting farmed cod on the menu, it says pressure will be taken off
  rock-bottom wild stocks.
Rock-bottom mortgage rates and various anti-foreclosure programs put something
  of a bottom on house prices.
Rock-bottom interest rates forced investors to flee to the stock market, but
  now their last refuge looks scary.
But because of deflation, its bond yields remain at rock-bottom levels.
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