(computing) A permission to access files or directories where the user is only allowed to read or view, not to make changes.

plural of only game in town.

(idiomatic, almost always preceded by the) The only opportunity, activity, or resource available.

Synonym of God knows

(computing) A computer memory chip that stores values but does not allow updates, in which the values are nonvolatile in that they are retained even when the computer is unpowered.

A market at which vendors may only sell items which they or their employees produce.

The situation where an event is so well attended, or public transportation so full, that all of the seats in the venue are occupied, leaving only the ground or the floor for other people.

Alternative form of God knows (“it is unknown to people”)

(idiomatic) Alternative form of time will tell

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