If this aspect sits in your natal chart, you were born inside a very narrow window of time. An exact opposition between Uranus and Pluto comes round only once in a century or so, and the last wave fell at the very start of the twentieth century. Most people alive today don't carry the exact opposition but its echoes — through a wide orb, or through the activation of faster planets to natal Uranus and Pluto. Yet if you genuinely have it in a tightish orb, the axis runs through your life as a background pressure you've grown so used to that you no longer count it as anything unusual.
Here is how I see it. Two strong forces live inside you, pulling in opposite directions. The first is Uranian: it wants freedom, novelty, unorthodox solutions; it can't bear a life that turns predictable; and it is the same force behind your knack for grasping in an instant what takes other people years to reach. The second is Plutonian: it wants depth, it digs down to the root, it doesn't trust the surface answer and it takes every subject all the way to the end. On their own each force is splendid. Set on the axis of an opposition, together, they make a person who can live neither in pure freedom nor in pure depth. Freedom without depth starts to feel like running away. Depth without freedom starts to feel like a cage. You are forever hunting for the point where both forces are allowed to exist.
When the balance tips, the opposition shows itself through abrupt reversals that wipe out what came before. You can work in one field for years, then wind the whole thing up in a month and begin again. You can live with someone for a decade and decide to leave in the course of a single night. You can be loyal to a group, then suddenly understand that you can no longer be part of it. These swings aren't whims, and they aren't simple exhaustion. They are the opposition firing — the moment the Plutonian side finishes its long reckoning and the Uranian side gives the order to move. To everyone around you it looks sudden and unaccountable, because they can't see the inner timer that has been counting down.
The body carries this aspect too. The nervous system of someone with a tight Uranus–Pluto opposition is rarely settled. A constant rewiring goes on inside, so sleep can be uneven, reactions quick and strong, and the capacity to sit in monotony for long stretches fairly low. None of that is a fault; it is a feature of the design. What helps is not forcing the nervous system into calm but giving it an honest rhythm — plenty of movement, little pressure, and regular spells of genuine quiet without outside stimulation.
Professionally this aspect often steers people into work where a system has to be rebuilt rather than merely improved — torn down and reassembled from scratch. That can mean science, the arts, reform, the deeper layers of psychotherapy, any work that asks for a fresh pair of eyes and the stomach to dig to the root at the same time. Inside a tidy corporate structure such people usually feel boxed in. They tend either to become the ones who change the rules from the top, or to leave and build something of their own. The third option, in which they pretend to be ordinary employees, generally ends in burnout or illness.
In relationships the opposition asks for a rare blend in a partner: steadiness together with a readiness to change. If the person beside you tries to soothe you and pin you into one fixed shape, the axis switches to resistance and you start dismantling the bond from inside. If the person beside you is in motion themselves yet doesn't lose their own centre, the axis works differently — you pass through the rebuildings side by side, and each one leaves the bond stronger than before.
To see how this opposition actually behaves in your particular chart — which houses the axis crosses, which faster planets switch it on, and in which seasons of life it steps to the front — you need a natal reading tied to your own themes and your own age. None of this is fixed fate; it is a way of reading the design you were born with.