浪費
ろうひ · rouhi · JLPT N1 · noun
waste
💸 Rou (露, dew) + hi (費, expense): wasting money is like dew evaporating away, gone for nothing.
浪 — water radical 氵 + 良 (good/phonetic)
浪 is a phono-semantic compound: 氵 (water) gives the meaning and 良 supplies the sound. It originally referred to waves on water, then extended figuratively to anything surging, unrestrained, or wandering — hence modern senses like 'wave,' 'wasteful,' or 'dissolute.'