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]
(..) Do you want to pay me to know where it is? Just 'cause there's something on the ground doesn't mean there's anything beneath it. Why did Standard Oil buy up land? Is it in California? -Maybe. -How much land did they buy? I'd like it better (..)2007 There Will Be Blood