1. on + us => 责任和负担落到了我们身上。在我们身上有责任和义务。
2. onus => oner-.
中文词源
onus 责任，职责
来自拉丁语onus,责任，重担，来自PIE*en,担子，可能来自PIE*an,在上面，词源同on.
英文词源
onus (n.)
1640s, from Latin onus "load, burden," figuratively "tax, expense; trouble, difficulty," from PIE *en-es- "burden" (source of Sanskrit anah "cart, wagon"). Hence legal Latin onus probandi (1722), literally "burden of proving."
双语例句
1. The onus is on employers to follow health and safety laws.
雇主有义务遵行健康安全法。
来自《权威词典》
2. The onus is on government departments to show cause why information cannot be disclosed.
政府部门有责任说明不能把信息公开的理由.
来自《简明英汉词典》
3. The onus is on the shopkeeper to provide goods which live up to the quality of their description.
店主有义务提供质量与其描述相符的商品。
来自柯林斯例句
4. The onus of proof is reversed in libel actions and placed firmly on the defender.