redouble

verb

1. (transitive)To double, especially to double again; to increase considerably; to multiply; to intensify.

   “Having lost sight of our objectives, we redoubled our efforts.”

   “Every item of intelligence appeared to redouble the astonishment of the islanders, and they gazed at us with inquiring looks.”

   “The police redoubled their efforts to capture the thieves.”

   “He heard the footsteps of his pursuers behind him, and redoubled his own pace. Once he got out of these by-ways he would be safe.”

   “With suggestions that inflation will rise above 15%, I have no doubt that today's trade union leaders will redouble their efforts to secure their members a good deal.”

2. To double an opponent's doubling bid.
3. (intransitive)To become twice as big.
4. To double again what was reduced to a single state.

   “Like the Conservatives and Labour, the Lib Dems plan to extend Britain's rail network, reopen stations and redouble singled routes.”

noun

1. An optional bid made by the side currently holding the highest bid for the contract, after the opposing side has doubled.