An instrument of punishment designed and used to inflict torture on the condemned person(noun)
WordNet. Princeton University. 2010.
Use "instrument of torture" in a sentence
"Many passages in Lord Byron's poetry show that he intended to make this daughter a future partisan against her mother, and explain the awful words he is stated in Lady Anne Barnard's diary to have used when first he looked on his little girl, ” 'What an instrument of torture I have gained in you!'"
"I'd like to see the man that would persuade me to put blinders or check-reins or any other instrument of torture on my horses."