To run out of time is to have none left before the deadline. The last question unanswered, the pen going down anyway.
It is run out of, all three words, and the of is compulsory — you run out of milk, of patience, of excuses, the same shape every time. What makes this one useful is that it works as both a fact and an apology: we ran out of time is the standard thing said at the end of a meeting where somebody did not get their turn. Against the clock and time is up are the near neighbours.
1phraserun out of timeTo have nothing left before the deadline.
“We are going to run out of time if the debate goes on.”
run out of time is a failure to finish before the deadline.
Practised in Common Word Pairs