forwork

To forfeit (a possession, privilege, etc.); ruin (oneself) by one's own conduct.

To obstruct; barricade; block.

And Æthelwold sat within the ham, with the men that to him had bowed, and he had forwrought [obstructed] all the gates in, and said that he would either there live or there lie.

To do wrong to; injure; scathe.

To overwork; exhaust with toil.

And toiling so, well-nigh forwrought, She prayed full fervently; […]