adjective
an adjective describes a noun or pronoun, in this case 'moth eaten' describes something that has been damaged or eaten by moths
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The antique rug in the museum was moth-eaten and in need of restoration.
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I found a moth-eaten sweater at the thrift store for a great price.
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His old leather jacket looked so moth-eaten, it was embarrassing.
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The once grand mansion now stood in ruins, its moth-eaten facade a sad reminder of its former glory.