節約
せつやく · setsuyaku · JLPT N3 · noun
economizing
💰 節約 = moderation (節) + cut back (約): moderate use, cut back = saving
節 means moderation or restraint, as in 節度 (sense of moderation). 約 means to tighten or cut down, as in 約束 (a promise that binds you). Holding back and tightening up your spending is economizing.