adjective
made of two parts that are similar or exactly the same
having two very different parts or qualities
If you are leading/living a double life, you have something secret that you do as an important part of your life in addition to the regular parts of your life that other people know about.
of a size that is twice as big as usual :of an amount that is twice as much as usual
coming from two different places or sources
two times as great or as many as the number, amount, size, etc., of something else
made for two people to use
of a flower :having more than the usual number of petals
verb
doubles; doubled; doubling
[+ obj] :to cause (something) to become two times as great or as many
[no obj] :to become two times as great or as many
[no obj] :to have a second job or use - + as
[+ obj] :to bend or fold (something, such as a piece of paper) usually in the middle - usually + over or up
to bend forward at the waist - usually + over or up; [no obj]
[no obj] baseball :to hit a double :to hit the ball so that you can reach second base
double back
[phrasal verb]
to turn around and return on the same path
double up
[phrasal verb]
to share a place to live or sleep that is made for one person or one family
double up on
[phrasal verb]
double up on (something) :to use or do two times as many of (something)
noun
plural doubles
[singular] :something that is two times the usual size, strength, or amount
[count] someone who looks very much like another person
a person who looks like an actor and takes the actor's place in some scenes in a movie or TV show
[count] baseball :a hit in baseball that allows a batter to reach second base
doubles [plural] :a game of tennis or a similar sport that is played between two pairs of players
[count] :a room in a hotel, inn, etc., for two people
double or nothing
US or Brit double or quits
a gambling bet in which you could win two times as much money as you have already won or you could lose all of the money
on the double
US or Brit at the double
informal :very quickly :as soon as possible
adverb
two times as many or as much
two times - usually used in combination
bend double
to fold in the middle.
Bend double is used more frequently in British English than in U.S. English.
see double
to see two things when only one thing is present
that goes double for
informal - used to say that something you have just said about one person or thing relates even more strongly to another