oh dark thirty
Some unspecified hour in the early morning (implying an unpleasant time to be awake).
I had to get up at oh dark thirty to catch a plane.
ADJ.
all, better, delayed, finished, heaviest, late, left, long
The project was finished thirty minutes late because of unexpected technical issues.
VERB + THIRTY
accommodate, back, bridge, cost, meeting, numbered, rises, takes
The new conference room can accommodate thirty people comfortably for our weekly meetings.
THIRTY + NOUN
capsule, degrees, dollars, i'll, length, meters, minutes, people
The temperature rose to thirty degrees yesterday afternoon.
PREP.
from, in, in, than
She has been working at the company for thirty years now.
ADV.
only, seldom
I've only been to that restaurant thirty times in the last five years.