noun
persistence; single-mindedness; sticking to one thing
Describes a person who stubbornly insists on one approach, opinion, or activity, often to the exclusion of alternatives. Can carry a slightly negative nuance of inflexibility.
彼は自分の意見の一点張りで、人の話を聞かない。
He stubbornly sticks to his own opinion and won't listen to others.
あの子はゲーム一点張りで、勉強を全くしない。
That kid is completely obsessed with games and doesn't study at all.
noun
always betting on the same thing
Original literal meaning from gambling: repeatedly placing the same bet. Now mostly used in figurative contexts or when explaining the etymology of the word.
「一点張り」はもともと、同じ賭けにこだわることを指した。
Originally, 'ittenbari' referred to sticking to the same bet.