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2.
dating someone that is on a lower caliber as yourself.
Or one who is not excelled as far a you have in any aspect

example: The chairman of a company dates a mailroom clerk
When we met I knew I was dating-down but he made my heart melt.
by ms-too_cute April 05, 2007
 
1.
Dating someone of a much lower caliber than you have in the past or are worthy of.
Friend #1 - 'Wow! She left a Biochemist with a Ph.D and a six figure salary to date a drugged out, abusive, divorced waiter who can't keep a job!'

Friend #2 - 'Yeah, no kidding... She was REALLY dating down with him! Good thing she finally got it together and left that loser!'
by SuperNurse7380 June 04, 2010
 
3.
Dating someone who is of lower caliber than you. Often done to hurt your ex.
Lowering their status as you lower yours.
After they broke up, Bill started dating-down with full figured women, when asked by friends, he stated you know I like big women. his ex who was size 8 went on a crash diet.
by Gakkuri January 14, 2010