The onus is the duty or the heavy job of dealing with something — the responsibility that sits on you. English almost always uses it in a small set of shapes: the onus is on you to… and the onus of proof (in law, the job of proving the claim).

The onus責任 is是 the duty or the heavy job of dealing with something處理某件事的義務或重擔 — the responsibility that sits on you壓在你身上的那份責任。English英文 almost always uses it幾乎都用固定的幾種說法 in a small set of shapes: the onus is on you to…「the onus is on you to…」（責任在你身上，要去…） and和 the onus of proof「the onus of proof」（舉證責任） (in law在法律上, the job of proving the claim指負責證明這個主張的責任)。

It is a formal, slightly lawyerly word. Friends would just say it’s on you or that’s your job.

It它 is是 a formal, slightly lawyerly word正式、有點像律師會用的詞。Friends朋友之間 would just say就只會說 it's on you「這是你的事」 or或 that's your job「那是你的工作」。

You cannot really pile up onuses in casual talk; people rarely make a plural of it.

You你 cannot really pile up onuses在日常對話裡不太會把 onus 講成複數 in casual talk; people人們 rarely make a plural of it很少把它變成複數。

Though actually, it sounds like on us, and that is a useful accident for memory — the burden is on us — but it is not two English words stuck together. It came in as a learned borrowing from Latin onus, literally “burden,” the kind you carry.

Though actually不過其實, it它 sounds like聽起來像 on us「on us」, and而 that那 is a useful accident for memory是幫助記憶的巧合 — the burden is on us負擔在我們身上 — but不過 it它 is not two English words stuck together並不是兩個英文字黏在一起。It它 came in as a learned borrowing是個學術性的外來詞 from Latin onus源自拉丁文的 onus, literally "burden,"字面意思是「重擔」 the kind you carry是那種你要扛著的東西。