open

See:

A golden key can open any door an open book an open marriage an open sesame be an open book be open to [abuse etc.] be wide open blow wide open break open bust wide open can of worms come out in the open come out in the open with crack a bottle open crack open doors open up greet with open arms have an open mind heavens opened honest and aboveboard in the open keep an open mind keep eyes open keep options open keep weather eye open

lay open leave oneself wide open for leave open leave open the possibility of leave the door open not open mouth open a can of worms open a conversation open a Pandora's box open and shut open book open doors open eyes open eyes to open fire open for business open heart open heart to open into open kimono open mind open mouth open old wounds open on open oneself to criticism

open out open Pandora's box open season open secret open some doors open the door to open the floodgates open the way for open to open to criticism open to question open up open up to open with open-and-shut case open-ended out in the open push at an open door receive with open arms the heavens opened throw open to When one door shuts, another opens wide open with eyes open with open arms