Mumbai, Aug. 20 -- Euro holds over a three-month high against the dollar on Thursday, following a sharp jump in the previous session amid dollar plunge. The dollar index shed close to 1% yesterday after the US Treasury Department stepped in to provide relief to bond markets. The Treasury Department announced that it would at least double the maximum size of its liquidity-support buyback operations for longer-dated nominal securities. The current maximum size of $2 billion per operation will be at least $4 billion per operation. Dollar index slumped by near 1% yesterday and edged below 99 mark Meanwhile, elevated oil prices amid ongoing geopolitical tensions are seen driving inflation and increasing expectations of an ECB rate hike. Curren...