Definitions from Wiktionary (redouble)

▸ verb:  (transitive) To double, especially to double again; to increase considerably; to multiply; to intensify.
▸ verb:  (bridge, backgammon) To double an opponent's doubling bid.
▸ verb:  (intransitive) To become twice as big.
▸ verb:  To double again what was reduced to a single state.
▸ noun:  (bridge) An optional bid made by the side currently holding the highest bid for the contract, after the opposing side has doubled.

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