GNU Collaborative International Dictionary of English

Found one definition

1.       
   Tagger (?), n.
   1. One who, or that which, appends or joins one thing to another.
   
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   2. That which is pointed like a tag.
   
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   Hedgehogs' or procupines' small taggers. Cotton.
   
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   3. pl. Sheets of tin or other plate which run below the gauge.  Knight.
   
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   4. A device for removing taglocks from sheep.  Knight.
   
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