“Watering down” in Japanese
Short answer
Watering down in Japanese is “水増し” (mizumashi). Full meaning: dilution, watering down; inflation (of budget, claim, etc.), padding.
Other ways to say “Watering down” in Japanese
骨抜き
honenuki boning (fish or meat), deboning; watering down (a plan, bill, etc.), dilution, emasculation; taking the backbone out of, weakening
骨ぬき
honenuki boning (fish or meat), deboning; watering down (a plan, bill, etc.), dilution, emasculation; taking the backbone out of, weakening
骨ヌキ
honenuki boning (fish or meat), deboning; watering down (a plan, bill, etc.), dilution, emasculation; taking the backbone out of, weakening
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