bottom out

bottom out idiom
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.

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