redouble verb 4noun 1forms 5 verb4 •To double, especially to double again; to increase considerably; to multiply; to intensify.Having lost sight of our objectives, we redoubled our efforts. •To become twice as big. •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. — 2019 •To double an opponent's doubling bid. noun1 •An optional bid made by the side currently holding the highest bid for the contract, after the opposing side has doubled. formsredoubled · redoubling · redoubles · redoubleth · redoublest