1. double eagle a former gold coin in the United States worth 20 dollars
  2. double-glaze provide with two sheets of glass
  3. double quotes a pair of quotation marks
  4. double cross an act of betrayal
  5. double helix a pair of parallel helices intertwined about a common axis
  6. double gold very tall branching herb with showy much-doubled yellow flower heads
  7. double-dealer a person who says one thing and does another
  8. double obelisk a character used in printing to indicate a cross reference or footnote
  9. double boiler two saucepans, one fitting inside the other
  10. double-geared equipped with compound gearing consisting of 2 pinions and 2 wheels in mesh to increase the mechanical advantage
  11. double agent a spy who works for two mutually antagonistic countries
  12. double fault (tennis) two successive faults in serving resulting in the loss of the point
  13. double glazing a window with two panes of glass and a space between them
  14. duplex house a house with two units sharing a common wall
  15. double-bass pitched an octave below normal bass instrumental or vocal range
  16. double bass largest and lowest member of the violin family
  17. double salt a solution of two simple salts that forms a single substance on crystallization
  18. double talk deliberately unintelligible gibberish
  19. double-crosser a person who says one thing and does another
  20. double creme cream with a fat content of 48% or more

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