The straw that broke the camel’s back(idiom)
It means a one that have had it enough of being patient and his nerve load reached the maximum and a one tiny mistake or problem would easily make him explode.
Hindi meaning:किसी बात पर अपने सबर का आपा खो देना
Synonyms: Breaking Point, Deciding Factor, End of Line, Final Stroke, Limit
Example: I was already fed up with his laziness and insensitivity, but Jim's refusal to come with me to my ownmother's funeral was the straw that broke the camel's back.
Trick to remember: Mobile broke karne pe aajkal log The straw that broke the camel’s back ho jate hai. 
