the last / final straw

/ðə lˈast fˈaɪnəl stɹˈɔː/

/ðə lˈæst fˈaɪnəl stɹˈɔː/

the final and decisive event or action that pushes someone beyond their tolerance or patience, leading to a significant reaction or decision

Examples

1. For most cosmologists, the last straw came with the discovery of the cosmic microwave background radiation in 1964.

2. Losing my job was bad enough, but being evicted was the final straw.

3. It had been a difficult week, so when the car broke down, it was the last straw.

4. This is the last straw.