redoubleth

Verb

redouble (third-person singular simple present redoubles, present participle redoubling, simple past and past participle redoubled)

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.
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.2019 December 4, “Lib Dems promise fares freeze and low-emission technology”, in Rail, page 6

See all 5 meanings of redouble