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WordNet-Online 
 Definitions from WordNet
Verb bristle up has 1 sense 
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| Definitions from the WebBristle UpDefinition:To react with anger or annoyance; to become agitated Part of Speech:Phrasal verb Senses:
 
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| briss brist bristle bristle  bristle at bristle brush bristle fern bristle grass bristle up bristlecone fir bristlecone pine bristled bristlegrass bristlelike bristles bristletail bristling 
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