E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
I am all adrift. He is quite adrift. To turn one adrift. Sea phrases. A ship is said to be adrift when it has broken from its moorings, and is driven at random by the winds. To be adrift is to be wide of the mark, or not in the right course. To turn one adrift is to turn him from house and home to go his own way.