Last straw

The phrase "last straw" refers to a metaphorical expression that indicates a final act, event, or occurrence that is perceived as intolerable or unacceptable and leads to a decisive action or a breaking point. It implies that there have been multiple preceding issues or problems, and the "last straw" represents the final and decisive element that prompts a significant reaction or decision. The proverbial "last straw" is often associated with the concept of reaching one's limit or threshold.