double.

Made up of two matching or complementary elements.

The closet has double doors.

Of twice the quantity.

Give me a double serving of mashed potatoes.

Britain's population density used to be double that of China.

Of a family relationship, related on both the maternal and paternal sides of a family.

He's my double cousin as my mother's sister married my father's brother.

Designed for two (people, cars, etc.).

a double room

a double garage

Folded in two; composed of two layers.

Stooping; bent over.

Having two aspects; ambiguous.

a double meaning

False, deceitful, or hypocritical.

a double life

Of flowers, having more than the normal number of petals.

Of an instrument, sounding an octave lower.

a double bass

Of time, twice as fast.

Twice over; twofold; doubly.

Two together; two at a time.

When I met the twins, I thought I was seeing double.

There are only a few beds, so some of the children will have to sleep double for the night.

Into two halves or sections.

The old man was bent double under his heavy burden.

Twice the number, amount, size, etc.

I did double his sales this month.

A person who resembles and stands in for another person, often for safety purposes

Saddam Hussein was rumored to have many doubles.

A drink with two portions of alcohol.

On second thought, make that a double.

Two shifts of work back to back.

I work a double this weekend.

A ghostly apparition of a living person; a doppelgänger.

A sharp turn, especially a return on one's own tracks.

A redundant item for which an identical item already exists.

I have more than 200 stamps in my collection but they're not all unique: some are doubles.

Before printing the photos, Liam deleted the doubles.

A two-base hit.

The catcher hit a double to lead off the ninth.

A call that increases certain scoring points if the last preceding bid becomes the contract.

A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.

A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.

The narrow outermost ring on a dartboard.

A hit on this ring.

A tile that has the same value (i.e., the same number of pips) on both sides.

A double-precision floating-point number.

The sine function returns a double.

Two competitions, usually one league and one cup, won by the same team in a single season.

A boat for two scullers.

The feat of scoring twice in one game.

The feat of winning two events in a single meet or competition.

In 1996, Michael Johnson achieved a double by winning both the 200 and 400 meter dashes.

The achievement of 1000 runs and 100 wickets taken in a single season.

A former French coin worth one-sixth of a sou.

A copper coin worth one-eighth of a penny.

Playing the same part on two instruments, alternately.

A double feast.

Synonym of double-quick (“fast marching pace”).

A secondary instrument with which a musician is skilled.

A double-cross or betrayal.

A double agent.

Someone who identifies with the same kintype.

Someone who yumeships with the same character as another person.

To multiply by two.

The company doubled their earnings per share over last quarter.

To increase by 100%, to become twice as large in size.

Our earnings have doubled in the last year.

To be the double of; to exceed by twofold; to contain or be worth twice as much as.

To fold over so as to make two folds.

To make a pleat, double the material at the waist.

To clench (a fist).

To get a two-base hit.

The batter doubled into the corner.

To join or couple.

To repeat exactly; copy.

To serve a second role or have a second purpose.

A spork is a kind of fork that doubles as a spoon.

To act as substitute for (another theatrical performer in a certain role, etc).

To play (both one part and another, in the same play, etc).

To turn sharply, following a winding course.

To sail around (a headland or other point).

To duplicate (a part) either in unison or at the octave above or below it.

To be capable of performing (upon an additional instrument).

To make a call that will double certain scoring points if the preceding bid becomes the contract.

To double down.

To cause (a ball) to rebound from a cushion before entering the pocket.

To go or march at twice the normal speed.

To multiply the strength or effect of by two.

Sorry, this store does not double coupons.

To unite, as ranks or files, so as to form one from each two.

To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.

Could you please repeat your last transmission? Another station was doubling with you.

To operate as a double agent.