sworn friends

基本解释

The two boys were sworn friends all the week, and embattled enemies on Saturdays.
这两个朋友平日里是莫逆之交，可到了星期六就成了对阵的敌人。
This bosom friend was joe harper. the two boys were sworn friends all the week, and embattled enemies on saturdays.
这两个朋友平日里是莫逆之交，可到了星期六就成了对阵的敌人。
dict.site
And during which period, I am honored to have made friends with thousands of famous tycoons in home appliances field all of world. We become sworn friends from business partners.
这期间，我有幸结识了数以千计的中外家电领域知名的企业界人士，大家从互惠互利的商业伙伴，成为志趣相投的莫逆之交。
yinghanhuyi.com

But we are also heirs to those who won the peace and not just the war, who turned sworn enemies into the surest of friends, and we must carry those lessons into this time as well.
FORBES: Full Text: President Obama's Inaugural Address
If you have sat across the table for months on end with Cyril Ramaphosa and found a way by which sworn enemies can come together to craft a new nation (and become firm friends), then the frustrations that drive the rest of us to distraction seem to count for little.
FORBES: Miracle Rising: Political Renaissance in South Africa