( a. )
To increase by adding an equal number, quantity, length, value, or the like; multiply by two; to double a sum of money; to double a number, or length.
( a. )
To increase by adding an equal number, quantity, length, value, or the like; multiply by two; to double a sum of money; to double a number, or length.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012