harmonize

verb

1 the colours harmonize well:

coordinate, go together, match, fit together, blend, mix, balance, tone in;

be compatible, be harmonious, be congruous, be consonant, be well coordinated, suit each other, set each other off.

▷antonyms clash.

2 the need to harmonize tax laws across Europe:

coordinate, systematize, correlate, match, integrate, synchronize, homogenize, bring together, make consistent, bring in line (with), bring in tune (with), tie in;

rare concert.

3 he tried to harmonize relations between the quarrelling factions:

reconcile, make harmonious, restore harmony to, make peaceful, patch up, repair, smooth out.

harmonize Oxford Dictionary of English