1
one's store of patience
See also:
堪忍袋の緒が切れる (かんにんぶくろのおがきれる)
1
to be out of patience;to be unable to put up with something anymore
ただでさえ奴は普段から仕事に遅れて来るくせに、酒まで飲んで来るなんて堪忍袋の緒が切れた。もう会社を辞めてもらうしかない。
It was bad enough that he usually came to work late, but coming in drunk was the last straw, and I'm going to have to let him go.