ichidan verb, intransitive verb
climb to the top; reach the summit
Used for physically ascending to the highest point of a mountain, stairs, or a tall structure. Often implies completion of the climb.
富士山に上り詰めるのは大変だった。
Climbing to the top of Mt. Fuji was tough.
長い階段を上り詰めると、
When I climbed to the top of the long staircase, a beautiful view spread out before me.
ichidan verb, intransitive verb
be engrossed in; be infatuated with
Metaphorical use: being completely absorbed in a hobby, interest, or person, as if reaching the peak of enthusiasm. Often used with に.
彼は最近、写真に上り詰めている。
Lately, he's been completely engrossed in photography.
彼女は彼に上り詰めて、他のことが手につかない。
She's so infatuated with him that she can't focus on anything else.