adjective
describes a state of being lifeless or unresponsive
preposition
shows the relationship between 'dead' and another word in the phrase
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The patient was declared dead to the world after being in a coma for several weeks.
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I'm dead to the idea of going out tonight, I just want to stay in and relax.
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She's dead to me after what she did, I can't trust her anymore.
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His heart was dead to love after experiencing so much betrayal in past relationships.