to whittle something down
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予算を削る前に、本当に必要な部分を見極めるべきだ。
Before cutting the budget, you should determine what is truly necessary.
睡眠時間を削ってまで働くのは長続きしない。
Working at the cost of sleep will not last long.
無駄な表現を削ると文章が引き締まる。
If you cut unnecessary expressions, the writing becomes tighter.