guard dog

guard dog

noun
a large, aggressive dog, as a German shepherd or Doberman pinscher, trained to guard persons or property and often to attack or restrain on command.
Also, guard·dog.


Origin:
1790–1800
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Guard dog is always a great word to know.
So is doohickey. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a gadget; dingus; thingumbob.
WordNet
guard dog

noun
a dog trained to guard property [syn: watchdog
WordNet® 3.0, © 2006 by Princeton University.
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