to increase to four times as much; to multiply by four
Comprised of four individual members.
Four times as great; quadruple.
by a factor of four
An algebraic variety of degree 4.
To multiply by four.
To increase by a factor of four.
To provide four parallel running lines on a given stretch of railway.
Being four times as long, as big or as many of something.
A figure-skating jump with four revolutions in the air.
Something that is four times the usual number, amount, size, etc.