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]
(..) but this is one of Cole's blue rose cases. The clues found by Special Agent Desmond and Agent Stanley... have led to dead ends. The letter extracted from beneath the fingernail of Teresa Banks... gives me the feeling the killer will strike again. But like the song goes... "Who knows where or when?" (..)1992 Twin Peaks: Fire Walk with Me