vorbeikommen
to drop by
To visit someone for a short, usually informal time.
Komm doch heute Abend einfach mal auf einen Kaffee vorbei.
Why don't you just drop by for a coffee this evening?

to drop by / pass by
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to drop by
To visit someone for a short, usually informal time.
Komm doch heute Abend einfach mal auf einen Kaffee vorbei.
Why don't you just drop by for a coffee this evening?

'Vorbeikommen' (to drop by / pass by) is a separable verb. The prefix 'vorbei-' stands at the end in a main clause. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Meine Tante kommt morgen kurz vorbei.
My aunt is dropping by briefly tomorrow.
Since 'kommen' (to come) is a verb of movement, the perfect tense of 'vorbeikommen' is always formed with the auxiliary verb 'sein' (to be).
Bist du gestern bei Thomas vorbeigekommen?
Did you drop by Thomas's place yesterday?
The preposition indicates the meaning. 'Bei' + person means a short visit. 'An' + place means that you pass something on your way.
Ich komme später bei dir vorbei, um das Buch abzuholen.
I'll drop by your place later to pick up the book.
For a short, informal visit, the verb is often combined with a purpose, for example 'auf einen Kaffee vorbeikommen' (to drop by for a coffee) or 'auf einen Sprung vorbeikommen' (to drop by briefly).
Hast du Lust, heute Abend auf einen Sprung vorbeizukommen?
Would you like to drop by briefly this evening?
In the figurative meaning, the expression is almost always negated: 'an etwas nicht vorbeikommen' (not to be able to get around something). It expresses that something is unavoidable or necessary.
Um die Prüfung zu bestehen, kommt man am Lernen nicht vorbei.
To pass the exam, you cannot get around studying.
to happen / pass
'passieren' and 'vorbeikommen' can both mean that someone or something moves along a place or reaches a point on the way. 'passieren' sounds more neutral and often a bit more precise, especially with borders, checkpoints, or fixed points. 'vorbeikommen' sounds more conversational and emphasizes more that you go or drive past something. The words can be confused because both describe movement past a place. The important point is: 'vorbeikommen' can also mean 'to drop by' for a short visit, but 'passieren' cannot have this meaning.

Auf dem Weg zur Schule kommen wir jeden Morgen an der Bäckerei vorbei.
On the way to school, we pass by the bakery every morning.
Der Bus passiert um acht Uhr die Grenze zur Schweiz.
The bus passes the border with Switzerland at eight o'clock.