phrase → straw If an event is the last straw or the straw that broke the camel's back, it is the latest in a series of unpleasant or undesirable events, and makes you feel that you cannot tolerate a situation any longer.
⇒ For him the Church's decision to allow the ordination of women had been the last straw.
⇒ Then came the recession. Revenues dropped, but the straw to break the camel's back
was the war.
COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers