In the current context, the key distinction is whether the population is open to entry after the exposure under study begins and open to exit before the outcome under study occurs (S. Greenland, University of California, Los Angeles, personal communication, 2013).
Lord Powell of Bayswater, who was at Thatcher's side during her most epic confrontations with Brussels during the 1980s, said the Eurosceptic former prime minister would always have preferred to battle the EU from within, whatever the scale of her frustrations, rather than opening the door to exit.
Use the paper towel that you just used to dry your hands as a 'glove' for turning the (filthy) tap off, and opening the door to exit the restroom.
The draws were to be opened to allow traffic to exit the beach by H+3 hours.
A lot of the meeting dealt with Twitter's acquisition angst and trying to decide "What do we want to be when we grow up?" The company has an "IPO Bias," yet realizes it will "always have to be open to Exits".
Peter, feigning frustration, opens a door to exit, setting off an alarm in the process.
If you must open a door to exit, use a paper towel.
When the door opens, allow passengers to exit before boarding the train.
We have seen emergency exits opened to get a breath of fresh air whilst waiting for take-off, emergency slides deployed in order to disembark quicker and an air stewardess' assault combined with a bomb threat; all for reasons only apparent to those involved.
Never enter a trailer in front of a horse without the side door open for you to exit.
