plural of railway key

(rail transport) A key that allows one to lock and unlock doors to railway carriages and compartments, typically only permitted to railway employees.

plural of answer key

An assorted list of solutions to problems or exercises in a test, textbook, etc.

(humorous) An imaginary item said to be possessed by anyone who is locked outdoors.

Third-person singular simple present indicative form of key up

Alternative form of subkey

(figuratively) Not in harmony (with); at odds (with).

(music) The tonic or keynote of a piece.

plural of home key