1) Four times as great or many 2) Fourfold 3) Increase fourfold 4) Multiple 5) Quadruplex 6) Quadruplicate 7) To multiply by four 1) Fourfold 2) Multiple 3) Quadplex 4) Quadruplex 5) Quadruplicate 
• (v. t.) To multiply by four; to increase fourfold; to double; to double twice. • (v. i.) To be multiplied by four; to increase fourfold; to become four times as much. • (n.) four times the sum or number; a fourfold amount; as, to receive to quadruple of the amount in damages. • (a.) Fourfold; as, to make quadruple restitution;...
Quad'ru·ple adjective [ Latin quadruplus , from quattuor four: confer French quadruple . See Quadrate , and confer Double .] Fourfold; as, to make quadruple restitution; a quadruple alliance. Quadruple time (Mus.) , 
[adj] - having four units or components 2. [adj] - four times as great or many 3. [n] - a quantity that is four times as great as another 4. [v] - increase fourfold
Old barrel measure (also called Vierling) from the Markgräflerland in the German Baden wine region with a volume of 600 litres. The name derives from the fact that four ohms fit into it. These barrels were used as new(wine green) barrels similar to the French Barrique. See also under barrel types and hollow dimensions.
quadruplex adjective having four units or components; `quadruple rhythm has four beats per measure`; `quadruplex wire` adjective four times as great or many; `a fourfold increase in the dosage`
Four flips. Performing four positions during a jump. 
To multiply or to be multiplied by 4.