OOP - British/American translation

[Melinda Leydon]

No: HPFGUIDX 65017

I was so pleased with Scholastic this time for keeping in so many of the
British sayings.  I was delighted by the Happy Christmas, the jumper, the
trainers, etc.

I do have 2 questions for any British members.

1) What does prat mean?  They used it GOF too and though I get the general
idea, would really like a definition.

and 

2)  What about peaky?  Mrs. Weasley says Harry looks peaky when she first
sees him.  I thought it meant pale, but later in the book she comments how
pale he is (after the hospital scene).  So what is peaky?

Thanks!
Melinda