What is the meaning of doubled?

verb

• Increase twofold.
  • usage: "The population doubled within 50 years"
  • synonyms: double, duplicate
• Hit a two-base hit.
  • synonyms: double
• Bend over or curl up, usually with laughter or pain.
  • usage: "He doubled and vomited violently"
  • synonyms: double over, double, double up
• Do double duty; serve two purposes or have two functions.
  • usage: "She doubles as his wife and secretary"
  • synonyms: double
• Bridge: make a demand for (a card or suit.
  • synonyms: double
• Make or do or perform again.
  • usage: "He could never replicate his brilliant performance of the magic trick"
  • synonyms: duplicate, reduplicate, double, repeat, replicate

adjective

• Twice as great or many.
  • usage: "ate a double portion"; "the dose is doubled"; "a twofold increase"
  • synonyms: double, twofold, two-fold