Green’s Dictionary of Slang

throw-down n.

[wrestling jargon throw-down, a fall]

1. a defeat.

[UK]A. Binstead Mop Fair 116: None were quite bold enough to risk a throw-down.

2. a rejection; the termination of a relationship.

[US]E. Townsend Chimmie Fadden Explains 56: De Duchess is fraid dat [...] de nurse will swipe little Miss Fannie and de Duchess will get de trow-down for not bein dere.
[US]C. Connors Bowery Life [ebook] ere's sum t'ings er bloke can't git out uv his nut fer er long time. Wun uv dem, is w'ere a bundle he is stuck on gives him de merry laugh—yer know, de t'row down, de dinky-dink.
[US]H. Green Actors’ Boarding House (1906) 145: That dame with the rhinestone joolry who tried to butt in and get in our set, and got a throw-down.
[US]T.A. Dorgan Indoor Sports 13 Apr. [synd. cartoon] Huh —all the way from Newark to be stood up. Said he knew every press agent in town and this is the 5th throwdown.