pain
[peyn]

noun
1. physical suffering or distress, as due to injury, illness, etc.

2. a distressing sensation  in a particular part of the body: a back pain.

3. mental or emotional suffering or torment: I am sorry my news causes you such pain.

4. pains,
     a. laborious or careful efforts; assiduous care: Great pains have been taken to repair the engine perfectly.
     b. the suffering of childbirth.

5. Informal . an annoying or troublesome person or thing.

verb (used with object)
6. to cause physical pain to; hurt.

7. to cause (someone) mental or emotional pain; distress: Your sarcasm pained me.

verb (used without object)
8. to have or give pain.

Idioms
9. feel no pain, Informal . to be intoxicated: After all that free beer, we were feeling no pain.

10. on / upon / under pain of, liable to the penalty of: on pain of death.  

11. pain in the ass, Slang: Vulgar . pain ( def. 5 ) .

12. pain in the neck, Informal . pain ( def. 5 ) .