double
adjective
°Made up of two matching or complementary elements.
"The closet has double doors."
°Twice the quantity.
"Give me a double serving of mashed potatoes."
verb
°Twice over; twofold.
°Two together; two at a time. (especially in see double).
noun
°Twice the number, amount, size, etc.
°A person who resembles and stands in for another person, often for safety purposes.