Suppose a meeting is scheduled at 8:00am but is postponed to 9:00am (I am not sure if "postpone to 9:00am" is idiomatic). I want to say something like
The meeting ______(some verb or phrase) one hour.
How many ways can I fill in ____?
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Postpone is most certainly the right expression.
The meeting has been postponed one hour.
The meeting has been postponed until 9:00.
The following are also possible, but less likely for any kind of formal announcement:
has been pushed back to ...
has been delayed until ...
has been rescheduled to/for ...
You can use the verb reschedule which means to schedule again according to a different timetable. Source; https://www.merriam-webster.com/dictionary/reschedule.
Some ways (the first is my favourite) are:
The meeting has been put back one hour
The meeting has been put off for one hour
The meeting has been delayed by one hour
The next two are not quite there, they imply the meeting already started:
The meeting has been held up for one hour
The meeting has been adjourned for one hour