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.
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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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American Heritage
Idioms & Phrases

rock bottom

The lowest possible level, absolute bottom, as in Wheat prices have reached rock bottom. This idiom alludes to the presence of bedrock that prevents digging farther down. [Late 1800s]

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
To them it smelled of government regulation, limited yields, and higher taxes
  at a time when wine prices were at rock bottom.
But prices are rock bottom for these portions and true gluttons wouldn't eat
  anywhere else.
Property tax bills go up, home prices remain at rock bottom.
Aquatic vegetation is uncommon, due to the gravel and rock bottom.
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