arse

Multiple Entries:
  arse    pain  

Concise Oxford English Dictionary © 2008 Oxford University Press:
arse /ɑːs/ Brit. vulgar slang

▶noun a person's buttocks or anus. ▶verb

• 1 (arse about/around) behave in a stupid way.

• 2 (can't be arsed) have insufficient interest to do something.

– origin OE ærs, of Gmc origin.

Concise Oxford English Dictionary © 2008 Oxford University Press:
pain/peɪn/

▶noun

• 1 a strongly unpleasant bodily sensation such as is caused by illness or injury.

• 2 mental suffering or distress.

• 3 (also pain in the neck or vulgar slang arse) informal an annoying or tedious person or thing.

• 4 (pains) careful effort.

▶verb cause mental or physical pain to.

■ chiefly N. Amer. (of a part of the body) hurt.

– phrases
on (or under) pain of on penalty of.

– derivatives
pained adjective.

– origin ME: from OFr. peine, from L. poena ‘penalty’, later ‘pain’.