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Related to bottom out: knock the bottom out
1. To reach a lower point or collapse entirely. Once the housing market bottomed out, I knew I'd be stuck with a bad investment—or sell the house for a significant loss Doctor, her blood pressure just bottomed out, and she collapsed.
2. Of a car, for the undercarriage to touch the ground. Be careful driving over those raised pothole covers—you don't want to bottom out.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Fig. to reach the lowest or worst point of something. All my problems seem to be bottoming out. They can't get much worse. Interest rates bottomed out last February.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
Reach the lowest level, as in The recession appears to have bottomed out. This verbal use of bottom originated in the late 1800s and, with the addition of out in the mid-1900s, tends to be used mostly in the context of trade and finance.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
To descend to the lowest point possible, after which only an increase is possible: The company's sales of computers have bottomed out, but they should increase when a new model comes out.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in. to reach the lowest or worst point of something. All my problems seem to be bottoming out. They can’t get much worse.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.