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

Synonym of God knows

plural of only game in town.

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

Alternative form of if only the tsar knew

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.

plural of write-only memory

(cryptography) An attack on a cryptosystem that relies only on the attacker's knowledge of some ciphertexts encrypted with that system and key. Less powerful than a known-plaintext attack.