Sentence:  `` Such as ' sending the cat to guard the <WSD>mice</WSD> ' , or ' the falcon to protect the dove ' , or most terribly sharp of all , ' the human being to save humanity '' ' . 
Meaning of the word marked with <WSD> tags:  any of numerous small rodents typically resembling diminutive rats having pointed snouts and small ears on elongated bodies with slender usually hairless tails