Slang; a term describing an extremely overvaluedsecurity or market. The price rises because investors believe it will keep rising indefinitely. This continues right up to the moment that the price crashes. The term describes a market bubble.
CASTLES IN THE SKY (BBC One, Thursday, 9pm) THE previously untold story of the fight to invent radar by Scotsman Robert Watson Watt (Eddie Izzard, pictured) and a team of unproven and unknown British scientists.