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double

adverb
  1. to double the degree
    twice
  2. two together
    “some people sleep better double”
  3. downward and forward
    “I was bent double with pain.”
adjective
  1. having two meanings with intent to deceive
    “a sly double meaning”
    forked
  2. large enough for two
    “a double bed”
  3. used of homologous chromosomes associated in pairs in synapsis
    bivalent
  4. twice as great or many
    “ate a double portion”
    twofolddoubledtwo-fold
  5. consisting of or involving two parts or components usually in pairs
    “an egg with a double yolk”
    dualduple
  6. having more than one decidedly dissimilar aspects or qualities
    “a double (or dual) role for an actor”
    threefoldtwofoldtrebledualtwo-foldthree-fold
  7. used of flowers having more than the usual number of petals in crowded or overlapping arrangements
    “double chrysanthemums have many rows of petals and are usually spherical or hemispherical”
noun
  1. a base hit on which the batter stops safely at second base
    “The batter hit a double to deep centerfield.”
    two-bagger
  2. raising the stakes in a card game by a factor of 2
    “I decided their double was a bluff.”
    doubling
  3. a quantity that is twice as great as another
    “36 is the double of 18”
  4. someone who closely resembles a famous person, especially an actor
    “I could be Arnold Schwarzenegger's double.”
    look-alikeimage
  5. a stand-in for movie stars to perform dangerous stunts
    “Their first job in Hollywood was as a double for the movie star.”
    stunt manstunt woman
verb
  1. increase twofold
    “The population doubled within 50 years”
    duplicate
  2. hit a two-base hit
  3. do double duty
  4. make or do or perform again
    duplicaterepeatreduplicatereplicate
  5. bend over or curl up, usually with laughter or pain
    “The drunk person doubled over and vomited violently.”
    double updouble over
  6. bridge: make a demand for (a card or suit)