Simple past tense and past participle of leech.(verb)
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Use "leeched" in a sentence
"If I were to play the numbers game, I would bet that chemicals leeched from the packaging used on genetically modified products will kill us first."
"At first all expression leeched from his pale blue face."
"The same thing is true in a microwave, where the energy is going straight into the food immediately, and so it kills those enzymes very quickly, as well, but without the problem you have in boiling of nutrients being leeched out into the water."