Leave someone in a boat or other craft which has nothing to secure or guide it.
Abandon or isolate someone.
1998 Oldie : The various dissenting movements should be cut adrift and left to their own devices.
Related Idioms :
be cast in a mould
be of the type specified.
1991 - Jean - Bow Jane's Journey - He was certainly not cast in a common mould. She had never met anyone like him before.
cast your bread upon the waters
do good without expecting gratitude or immediate reward.
This expression comes from Ecclesiastes 11 : 1 - Cast thy bread upon the waters : for thou shalt find it after many days.
cast the first stone
be the first to accuse or criticize.
The phrase comes from an incident recorded in St John's Gospel. A group of men preparing to stone an adulterous woman to death were addressed by Jesus with the words : He that is without sin among you, let him first cast a stone at her. (John 8 : 7)
cast something in his teeth
reject defiantly or refer reproachfully to a person's previous action or statement.