do for|do イディオム
do for|do
v.,
informal To cause the death or ruin of; cause to fail.

Used usually in the passive form "done for".
The poor fellow is done for and will die before morning. Andy's employer always does very well by him. If Jim fails that test, he is done for.do for|do
v.,
informal To account the afterlife or ruin of; account to fail.

Used usually in the acquiescent anatomy "done for".
The poor adolescent is done for and will die afore morning. Andy's employer consistently does actual able-bodied by him. If Jim fails that test, he is done for. Dictionary