n.
    - a strongly unpleasant bodily sensation such as is caused by illness or injury.
 - mental suffering or distress.
 - 
(also pain in the neck or vulgar slang arse)
 informal an annoying or tedious person or thing.
 - 
(pains)
 careful effort.
 
v.
 cause mental or physical pain to. 
▸chiefly N. Amer. (of a part of the body) hurt.
 
  Phrase
  
    
      - on 
(or under)
 pain of
 on penalty of. 
    
   
  Derivative
  
  Etymology
  ME: from OFr. peine, from L. poena ‘penalty’, later ‘pain’.