Simple past tense and past participle of water down.(verb)
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Use "watered down" in a sentence
"* It had answered well, as the Morgan family was not afraid of hard work, Dick Morgan never watered down his rum and gin, and the food available at dinner time (around noon) and supper time (around six) was excellent."
"Absurdity watered down panic and she willed herself to lie still and breathe deeply."
"They lost the 2000 World title because of this weakness, and the next year, when they finally won their World Championship, their one mistake came when Salé watered down a jump."