| open | something that is supposed to be secret but is generally known |
|---|---|
| open | any very successful means of achieving a result |
| open | a magical command |
| open | a company whose workers are hired without regard to their membership in a labor union |
| open | rear gunsight having an open notch instead of a peephole or telescope |
| open | (`hospitable' is usually followed by `to') having an open mind |
| open | (`capable' is usually followed by `of' or `to') possibly accepting or permitting |
| open | (United Kingdom) a British university that is open to people without formal academic qualifications and where teaching is by correspondence or broadcasting or summer school |
| open | make available, as of an opportunity |
| open | become available |
| open | talk freely and without inhibition |
| open | cause to open or to become open |