expression, adverb
with all one's might; wholeheartedly; giving it everything
Idiomatic expression derived from the image of tying a twisted headband tightly, symbolizing determination and full effort. Used adverbially.
See also: ねじりはちまき
試験に合格するために、ねじり鉢巻きで勉強した。
I studied with all my might to pass the exam.
彼はねじり鉢巻きで仕事に取り組んでいる。
He is tackling his work wholeheartedly.
From the practice of tying a twisted headband (ねじり鉢巻き) tightly around one's head to show determination and focus, often before a strenuous task. The adverbial form ねじり鉢巻きで literally means 'with a twisted headband on', figuratively 'with full resolve'.