Green’s Dictionary of Slang

(prize-fighting) a blow that doubles up one’s opponent.

1824		Pierce Egan’s Life in London 21 Nov. 349/1: Hudson caught him a tremendous blow and downed Cannon [...] The ‘tie-up’ was at no great distance and Josh endeavoured to make the best use of his knowledge.
1827		W. Clarke Every Night Book 84: Their [i.e. prize-fighters’] language he would find mighty mysterious [...] to ‘tip him a tie-up,’ is to give him a blow that bends him neck to heels.