He won't do any work that he considers 'beneath' him. [=work that he thinks is not good enough for a person of his social class]
He thought washing dishes was 'beneath his dignity'. [=he thought that he was too good or important to wash dishes]
The chair sagged 'beneath' [='under, underneath'] his weight. [=his weight caused the chair to sag]
(..) she died. Pretty in a common sort of way. She was the miller's wife. Apparently they had married without my knowledge or consent. So I had him hanged and I took her beneath the tree where he was swaying. She fought me the whole time. She was lucky I didn't hang her, too. I nearly had her whipped (..)2015 TvShow: Game of Thrones Title: Kill the Boy Season: 5 Episode 5