handcuff vs leg irons

handcuff

noun
  • One ring of a locking fetter for the hand or one pair. 

verb
  • To apply handcuffs to 

  • to restrain or restrict. 

leg irons

noun
  • A fetter or shackle attached at the ankle. 

How often have the words handcuff and leg irons occurred in a corpus of books? (source: Google Ngram Viewer )