Alternative form of God knows, in sense of something unknown to mortal men.

Synonym of God knows

plural of only game in town.

plural of producer-only market

plural of read-only memory

(rail transport) The operation of a train without a conductor or guard as a cost-cutting measure; one-man operation.

Alternative form of if only the tsar knew

If somebody at the top of an abusive hierarchy was aware of the abuses, they might take action to stop them.

plural of write-only memory

(computing) A type of computer memory to which data can be written, but from which it cannot be read. / (informal) A failed or otherwise inoperative memory device.