
hinüber
across
Expresses movement to the other side of something, away from the speaker.
Kommst du kurz zu mir hinüber?
Are you coming over to me for a moment?
across / broken / gone
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across
Expresses movement to the other side of something, away from the speaker.
Kommst du kurz zu mir hinüber?
Are you coming over to me for a moment?

broken
Colloquial for broken, destroyed, or no longer functional.
Nach dem Sturz war mein Handy komplett hinüber.
After the fall, my phone was completely broken.

passed away
A euphemistic, meaning softened, way of saying dead or deceased.
Nach langer Krankheit ist er letzte Nacht friedlich hinüber.
After a long illness, he passed away peacefully last night.
The adverb 'hinüber' consists of 'hin' and 'über'. The prefix 'hin' describes movement away from the speaker, while 'über' indicates movement over a boundary or to the other side.
Siehst du den Kiosk dort? Ich gehe mal kurz hinüber und kaufe eine Zeitung.
Do you see the kiosk over there? I'll just go across and buy a newspaper.
The literal meaning (movement) is almost always used with a verb of motion such as 'gehen' (to go), 'fahren' (to drive), or 'schauen' (to look). The colloquial meanings 'kaputt' (broken) or 'tot' (dead), on the other hand, almost always appear with the verb 'sein' (to be).
Er schwamm schnell zum anderen Ufer hinüber.
He quickly swam across to the other bank.
In the meaning 'kaputt' (broken), 'hinüber' is very colloquial. In formal or written contexts, other expressions would be used.
Lass das Glas nicht fallen, sonst ist es hinüber!
Don't drop the glass, or it'll be broken!
The use of 'hinüber' for 'gestorben' (died) is a euphemism. That means it is a gentler, indirect way of referring to an unpleasant topic.
Der alte Hund meiner Nachbarin ist letzte Woche ganz friedlich hinüber.
My neighbor's old dog passed away very peacefully last week.
dead
Tot says directly and clearly that someone is no longer alive. Hinüber can express the same thing colloquially and euphemistically, but depending on the tone it can also sound flippant. Use tot for a clear statement and hinüber only when this particular euphemism suits the tone.

Sein alter Nachbar ist letzte Woche hinübergegangen, wie er selbst immer scherzhaft sagte.
His elderly neighbor passed away last week, as he himself always jokingly said.
Nach dem Unfall war sofort klar, dass der Fahrer tot war.
After the accident, it was immediately clear that the driver was dead.