THESAURUS
split the difference
accommodate, adjust, apportion, average, average out, avoid extremes, be partners in, compose, compound, compromise, cooperate, cop out, divide with, divvy up with, duck responsibility, evade responsibility, give and take, give way, go even stephen, go fifty-fifty, go halvers, go halves, go shares, halve, make a deal, make an adjustment, make concessions, meet halfway, pair off, play politics, reach a compromise, settle, share, share in, strike a balance, strike a bargain, surrender, take the average, take the mean, yield
ROGET THESAURUS
split the difference
Mean
VB
split the difference, take the average, reduce to a mean, strike a balance, pair off.
Compromise
VB
compromise, commute, compound, take the mean,
split the difference, meet one halfway, give and take, come to terms, submit to arbitration, abide by arbitration, patch up, bridge over, arrange, straighten out, adjust, differences, agree, make the best of, make a virtue of necessity, take the will for the deed.