息事宁人的英文

爱屋及屋：Love House and estate下马威：Putting on airs right at the beginning of one's Office阿弥陀佛：Amitabha好事不出门，恶事行千里：Good things do not go out, evil and thousands阿谀奉承：Flattering百闻不如一见：It is better to see once than hear a hundred times癞蛤蟆想吃天鹅肉：Toad would eat a Swan八仙过海，各显神通：The Eight Immortals, each忠言逆耳：Good advice jars on the ear平步青云：How To Succeed In Business Without Really Trying不孝有三，无后为大：Three unfilial, no designation for large前不见古人，后不见来者：Ancients disappeared before, not after players八面玲珑：Eight-side exquisite路见不平，拔刀相助：Unfair on the road, take up the cudgels against an injustice不打自招：Mineo Nakajima打破沙锅问到底：Insist on getting to the bottom of the matter背井离乡：Uprooted from their homes哗众取宠：The Gallery疾风知劲草：Adversity tries a friend画虎不成反类犬：Painting a tiger counter-dog才高八斗：A man of great talent画龙点睛：Put the finishing touch优柔寡断：Indecision有口无心：Say what one does not mean高深莫测：Canny bureaucratic infighter...

口语里面just let it go书面的话可以用 to settle disputes and bring about peace；to make concessions; to avoid trouble; to gloss things over; to stay on good terms 等

silence..........

社会上的事情难免有磕磕碰碰，要懂的大事化小，小事化了

to patch up quarrels and reconcile the parties concerned[这个是参考了有道翻译，我觉得这是它翻译得令我满意的成语之一，意思表达出来了：平息争论，调解各方。]