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1. Literally, someone with whom one practices martial arts or boxing. OK, John here is going to be your new sparring partner. He's tougher than you're used to, but he'll help your skills improve.
2. By extension, someone with whom one engages in a debate, argument, or heated discussion, especially when one enjoys doing so. I was sad to hear he wouldn't be in the class next semester—he was my favorite sparring partner during class discussions. The two have been sparring partners on the morning talk show for nearly ten years.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
An individual with whom one enjoys arguing, as in Jim's my best sparring partner. This expression alludes to boxing, where since about 1900 it has denoted the person one practices or trains with. [Mid-1900s] Also see spar with.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
a sparring partner
Someone's sparring partner is someone they enjoy arguing with or discussing things with. My old sparring partner Chris Moyles has got the Radio 1 breakfast show in place of Sara Cox. Note: This expressing comes from boxing, where a sparring partner was someone to practise with.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012