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main man

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noun Informal.
  1. one's best and most trusted male friend.
  2. the most reliable, important, or respected man.
  3. one's main boyfriend.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for main man

main man

noun slang, mainly US
  1. one's best friend
  2. a boss or leader
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012