Idiom: the last straw Meaning Something is the last straw | English Idioms

Idiom:

the last straw

Meaning
Something is the last straw if it's the latest in a series of annoying or upsetting events, and it's the one that finally makes you do something about the situation.

For example:

I was already close to resigning, but the last straw was being bossed around by some kid twenty years younger than me. After that, I quit the job.

I saw my girlfriend flirting with another guy at the party, and that was the last straw. I told her our relationship was over and I left.
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