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last straw, the

last straw, the idiom

The final annoyance or setback, which even though minor makes one lose patience. For example, I could put up with his delays and missed deadlines, but when he claimed the work was unimportant—that was the last straw! This term is a shortening of the straw that broke the camel's back, which conveys a vivid image of an overloaded animal being given one slight additional weight. The expression dates from the mid-1800s, and replaced the earlier the last feather that breaks the horse's back.

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.