Definition from macmillandictionary.com
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Which colour do you want – red, green, yellow, or blue?
He’s probably at lunch or in a meeting.
‘When will you get the results?’ ‘Either tomorrow or the day after.’
You don’t care whether he lives or dies, do you?
The jury must decide whether the prisoner is guilty or not.
She’s had nothing to eat or drink all day.
I never had any help or advice from my parents.
I can photocopy your notes. It’ll only take a minute or two.
The car has to be serviced every five or six thousand miles.
The soldiers told everyone to leave or they would be shot.
We must deal with the problem now, or else it will be too late.
You’d better do what I say, or else (=I will do something bad to you).
There are six cashpoints, or ATMs, in the main airport terminal.
This is a problem for the government, or rather for the Prime Minister, to deal with.
He obviously doesn’t have a plan, or he would have said something.
It must be something serious, or else they wouldn’t have radioed for help.