noun
a piece of furniture typically consisting of a mattress supported by a frame
preposition
a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause
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The yogi demonstrated his ability to lie on a bed of nails without getting hurt.
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I can't believe he actually slept on a bed of nails for a dare!
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She's as tough as a bed of nails, nothing seems to faze her.
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Navigating through the busy city streets felt like walking on a bed of nails.