oner = burden

詞根來自拉丁語oner意爲burden。

1.exonerate [使從沉重的行李、負擔中解脫出來ex(=out) + oner(=burden)]
vt. 免除（責任、義務、苦難等）；証明...無罪
exoneration n.免除；釋罪
Many convicted criminals have been exonerated by DNA evidence.很多被宣告有罪犯依靠DNA証據被証明無罪。

2.onerous adj.繁重的；麻煩的
onerous duties 繁重的稅