Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A steep or abrupt downward slope.
 - noun A noticeable decrease.
 - noun A designated place where people or things can be left.
 
from the GNU version of the Collaborative International Dictionary of English.
- noun a noticeable decline in performance.
 - noun a steep high face of rock.
 - noun a change downward.
 
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun   A 
sudden downward slope  - noun   A sudden 
decrease (such as in the level of sales) 
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- verb leave or unload
 - verb get worse
 - verb fall or diminish
 - verb retreat
 - verb change from a waking to a sleeping state
 - noun a noticeable deterioration in performance or quality
 - noun a steep high face of rock
 - noun a change downward
 
Etymologies
Sorry, no etymologies found.
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Examples
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Whether a hypothetical abortion is for health or social/economic reasons, we see a similar drop-off in support, especially among the post-boomers.
American Grace Robert D. Putnam 2010
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Chapter 4 details a general drop-off in religiosity, but it is concentrated among whites.
American Grace Robert D. Putnam 2010
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In fact, there was a modest drop-off in the frequency of social or political sermons from 30 percent monthly to 22 percent.
American Grace Robert D. Putnam 2010
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It's even hard to get parents to leave at the close of freshmen drop-off weekend.
Mary Quigley: Electronic Umbilical Cord Mary Quigley 2011
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It's even hard to get parents to leave at the close of freshmen drop-off weekend.
Mary Quigley: Electronic Umbilical Cord Mary Quigley 2011
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Beyond the shoulder of the road was a steep drop-off that ended in a rock-strewn desert wash some fifty yards below.
Fatal Error J.A. Jance 2011
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That maelstrom swirls above a deepwater drop-off, where the sea falls away to a bottomless rift.
GuildWars Edge of Destiny J. Robert King 2011
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The country is also trying to recover from a drop-off in foreign investment in the past few years.
South African Recovery Under Pressure Devon Maylie 2011
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The drop-off in commodity prices underscored a growing concern among investors that geopolitical uncertainties and a weak start to the first-quarter corporate-earnings season could presage a weaker economic outlook.
Stocks Fall on Oil, Nuclear Worries Jonathan Cheng 2011
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But on Monday, Japan Airlines announced it would cancel seven of its 21 weekly flights to Honolulu from Tokyo's Narita International Airport for most of April, citing the drop-off in demand.
 
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