shredder
Word family adjectiveshreddedshreddyshredlessnounshreddershreddingshred
Offices
shred·der /ˈʃredə $ -ər/ noun [countableC] 
BBOa machine that cuts documents into small pieces so that no one can read them 碎纸机Examples from the Corpus
shredder• But their strength as vehicles for practice or as a first amp for a budding shredder would be difficult to challenge.• The bottom shelf was wider and it held a square white machine which looked like a document shredder.• Oh, our lettuce shredder fell apart.• And word got out that a paper shredder was busily eating superfund documents.• With more of the same in the forecast for the weekend, the record books are awaiting the shredder.• Then along came the shredder and the electric-arc steel furnace, which gobbled scrap steel.• The real money lay not in the shredder but in the shredded cereal.• Millions of books, as we now know, are relegated to the shredder every year.
From Longman Business Dictionary
shreddershred·der /ˈʃredə-ər/ noun [countableC]OFFICE
a machine that cuts documents into small pieces so that no one can read them