verb, historical
to attempt to pacify minority ethnic groups in the border areas, by marrying princesses (usually from minor branches of the royal family) to rulers of those minority states
adj, archaic
peaceful; harmonious; cordial
Examples (Wiktionary)
Mandarin
明知不对，也不同他们作原则上的争论，任其下去，求得和平和亲热。或者轻描淡写地说一顿，不作彻底解决，保持一团和气。
明知不對，也不同他們作原則上的爭論，任其下去，求得和平和親熱。或者輕描淡寫地説一頓，不作徹底解決，保持一團和氣。
míng zhī bù duì ， yě bù tóng tā men zuò yuán zé shàng de zhēng lùn ， rèn qí xià qù ， qiú dé hé píng hé qīn rè ． huò zhě qīng miáo dàn xiě de shuō yī dùn ， bù zuò chè dǐ jiě jué ， bǎo chí yī tuán hé qì ．
To let things slide for the sake of peace and friendship when a person has clearly gone wrong, and refrain from principled argument. Or to touch on the matter lightly instead of going into it thoroughly, so as to keep on good terms.