1 double /ˈdʌbəl/ adjective
1 double
Learner's definition of DOUBLE
: 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
2 double /ˈdʌbəl/ verb
doubles; doubled; doubling
2 double
doubles; doubled; doubling
Learner's definition of DOUBLE
[+ object] : to cause (something) to become two times as great or as many
[no object] : to become two times as great or as many
[no object] : to have a second job or use + as
[+ object] : 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 object]
[+ object]
[no object] 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
see also 2double 3b (above)

double up on

[phrasal verb]
double up on (something)
: to use or do two times as many of (something)
3 double /ˈdʌbəl/ noun
plural doubles
3 double
plural doubles
Learner's definition of DOUBLE
[singular] : something that is two times the usual size, strength, or amount
: 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
see also body double, stunt double
[count] baseball : a hit in baseball that allows a batter to reach second base compare home run, single, triple
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 compare single

double or nothing

(US) or British 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) informal or British at the double
: very quickly : as soon as possible
4 double /ˈdʌbəl/ adverb
4 double
Learner's definition of DOUBLE
: 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

used to say that something you have just said about one person or thing relates even more strongly to another