From Longman Dictionary of Contemporary Englishsplit the differencesplit the differenceAGREEto agree on an amount that is exactly between two amounts that have been mentioned OK, let’s split the difference, and I’ll give you £20. → split
Examples from the Corpus
split the difference• Their offer is only about $500 dollars less than we're asking, so we'll probably just split the difference.• Now let me see if I can split the difference.• Ross proposed that they split the difference and suggested a date in 1998.• Even those who attempt to split the difference are not too fussy about where the line is drawn.• We decided that I would live and split the difference between then and a projected now. 