The final minor problem or annoyance that makes a situation unbearable, causing someone to react strongly or give up entirely.
This phrase comes from the fuller expression 'the last straw that breaks the camel's back,' referencing an Arabic proverb about how even a single straw can break a camel's back if it's already carrying its maximum load. The shortened version became popular in the 19th century.
The genius of this phrase lies in its paradox - something tiny (a straw) causing something huge (complete breakdown). It perfectly captures how accumulated stress works: we can handle enormous burdens until one seemingly insignificant addition pushes us over the edge.
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