Here is a bad example of accepting Queen’s Gambit. The guy who was playing against me lost that way probably because of his lack of experience.
1. d4 d5 2. c4 dxc4 3. e3 b5 4. a4 c6 5. Qf3 g6 6. axb5 cxb5 7. Nc3 Bb7 8. Qxb7 Nd7 9. Nxb5 e6 10. Nc7+ Ke7 11. Nxa8 Ngf6 12. Rxa7 Ke8 13. Nc7+ Ke7 14. Qb4+ Nc5 15. Nd5+ Kd6 16. Qxc5#
The opponent should have resigned after my (white’s) 6th move, noticing his Queen’s side weakened. After winning the above game I was curious to see if that happened in some earlier high profile game. I found a similar game that dated back to yr. 1620 between Gioachino vs. NN, with only the (white’s) 5th and 6th move altered in sequence. That particular sequence of opening moves is ‘the old style’ of ‘Queen’s Gambit Accepted’.