Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Significant or important; major: a bigtime comedian.
  • adv. To an extreme degree; very much: Sales are expanding, big-time.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of major significance or importance
  • adv. to a significant degree

Etymologies

big +‎ time (Wiktionary)

Examples

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