open sesame
Immediate means of entrance, or unobstructed access to something.
Tom mistakenly believed that his wealth would be an open sesame to the world of creative arts.
open shop
A factory or firm that employs both union and non-union labor.
The firm refuses to adopt an open shop policy.
open the door
To allow more action or discussion; give a chance.
Learning to read and write opens the door to a better job and better living conditions.
Raising the tax rates will open the door to more help for older people.
open the floodgates
To let loose an outburst of human activity or emotion.
It would open the floodgates of anger and discontent if the university raised tuition too soon.
open the kimono
Выдавать что-то, что раньше было скрыто.
It's time to open the kimono and explain that we cannot meet the deadline.
Пришло время раскрыть правду и объяснить, почему мы не сможем сделать все в срок.
open up
To show for the first time; make clear; reveal.
The story of Helen Keller's life opened up a whole new world to Mary.
Einstein's theories opened up a whole new area for study.
To make available; present an opportunity; offer.
The building of the railroad opened up new lands to the pioneers.
John opened up a whole new section of the Scrabble board.
To go faster.
When they got out on the highway John opened up and drove at 65 miles per hour.
To begin to shoot.
When they got close to the enemy lines, they opened up with all they had.
To begin to talk frankly.
After John learned to trust Mr. Jones, he opened up and told him how he felt.
To spread out.
After a while the road opened up and they traveled more quickly.
To become available.
When she got her college diploma, many new jobs opened up.
open-door policy
A policy that states that newcomers are welcome to join the company, firm, or country in question.
During the nineteenth century the United States had an open-door policy regarding immigration.
open-minded
Having no dogmatic or biased views on matters of theory, religion, politics, etc.
Fred is easy to talk to about anything; he is a highly intelligent and open-minded person.