noun
store of patience; one's patience
Figurative noun for the capacity to endure or tolerate. Almost exclusively used in the set phrase 堪忍袋の緒が切れる (one's patience runs out / one's temper snaps).
See also: 堪忍袋の緒が切れる
彼の無礼な態度に、ついに堪忍袋の緒が切れた。
His rude attitude finally made me snap.
あんなに我慢強い人でも、堪忍袋の緒が切れることはある。
Even someone that patient can reach the end of their tether.