to reach: to get all the way to the thing something was heading for, whether a height, a place, a person, or an appointed time.
Every appearance of this word sits in the Aramaic chapters of Daniel, and every one of them is about something finishing its travel and touching what it was aimed at. A tree grows until its top touches the sky. Men thrown into a pit never make it down to the floor. The word is not about the going but about the getting there.
That is what lets one verb cover such different pictures. A height can get to the sky, a person can get to the place where God is seated, a sentence handed down in heaven can catch up with the man it was spoken against, and a date fixed long ago can finally land on the calendar. In each case something set in motion arrives at its target, and Daniel keeps reusing the word so the reader feels the link: the king's greatness gets as high as heaven in one chapter, and the punishment gets to the king in the next.
Daniel 7 sets the word directly beside the ordinary verb for coming (אֲתָה). In the night vision one like a son of man is coming with the clouds, and then he reaches the Ancient of Days. A few verses later the Ancient of Days comes, and the appointed time arrives. The plain verb carries the movement; this one marks the instant the movement lands.