redouble

From Middle French redoubler. Surface etymology is re- +‎ double.

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.

   • 1846, Herman Melville, Typee, ch. 10:

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

   • 1903, "Plunder Hidden in Graves," New York Times, 21 Oct., p. 16:

     The police redoubled their efforts to capture the thieves.

2. (bridge, backgammon) To double an opponent's doubling bid.
3. (intransitive) To become twice as big.

redouble (plural redoubles)

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

• IPA^(key): /ʁə.dubl/

redouble

1. first-person singular present indicative of redoubler
2. third-person singular present indicative of redoubler
3. first-person singular present subjunctive of redoubler
4. third-person singular present subjunctive of redoubler
5. second-person singular imperative of redoubler

• débouler