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to be stingy (with); to skimp (on)
材料費をけちると品質が落ちる。
If you skimp on material costs, quality drops.
交通費をけちって歩いて帰った。
I was stingy with transport and walked home.
交通費をけちったせいで、大幅に遅刻した。
I was very late because I skimped on transportation costs.