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The last of a series of annoyances or disappointments that leads one to a final loss of patience, temper, trust, or hope.
[From the proverb "It's the last straw that breaks the camel's back".]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the last straw the final irritation or problem that stretches one's endurance or patience beyond the limit
[from the proverb, "It is the last straw that breaks the camel's back"]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
the last of a succession of irritations or troubles that leads to a loss of patience, a disaster, etc.
[1840–50; after the proverb “Italian is the last straw that breaks the camel's back”]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
A setback that comes on top of several others and leads to final collapse or defeat.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited