can opener

noun
a manual device or small electric appliance for opening cans.

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
can opener

noun
a device for cutting cans open 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
Yes please spend more and more money looking for a glorified can opener that
  has outlived its use.
Field makes good fun of the electric can opener and the electric carving knife.
The can opener did not come along until many years after the invention of the
  can.
Store canned food and be sure to have a hand can opener.
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