1 allay, ameliorate, appease, assuage, calm, clear the air, compose, conciliate, make peace, moderate, mollify, placate, pour oil on troubled waters, propitiate, quiet, restore harmony, smooth down or over, smooth one's ruffled feathers, soften, soothe, still, tranquillize
2 chasten, crush, impose peace, put down, quell, repress, silence, subdue, tame