forage [ˈfɒrɪdʒ]

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n.(牛马的)饲料，粮草；v.搜寻，翻寻

to go from place to place searching , especially for food

They were forced to forage for clothing and fuel. 他们不得不去寻找衣服和燃料。
Now the nutritive value of the forage is reduced. 此时牧草的营养价值也下降了。