To double, especially to double again; to increase considerably; to multiply; to intensify.
To become twice as big.
To double an opponent's doubling bid.
To double again what was reduced to a single state.
An optional bid made by the side currently holding the highest bid for the contract, after the opposing side has doubled.
To make threefold; to triple.
by a factor of three
triple
three times as great
An algebraic variety of dimension 3.