Zerbricht comes from the verb zerbrechen, meaning 'to break' or 'to shatter'. While 'brechen' is a common verb for breaking, the prefix 'zer-' intensifies the meaning, implying something is broken into pieces or completely shattered.
In the song, the narrator sings, "Auch nicht, dass mein Herz zerbricht" (Also not, that my heart breaks/shatters). This powerful word vividly conveys the depth of his heartbreak, making it more impactful than a simple 'breaks' and highlighting the emotional intensity of the lyrics.
Have you ever had to deliver bad news to someone about a person they really cared about? That's exactly what's happening in Die Ärzte's "Wie Am Ersten Tag" [Like On The First Day]. Our singer sees someone heading towards his ex-girlfriend, and he knows this new person is now with her. He stops them to deliver a message: "Gib ihr zum Abschied von mir Einen letzten Kuss" [Give her one last kiss from me as a farewell].
What makes this song so interesting is the mix of heartbreak and a strange kind of dignity. He's clearly devastated, admitting "Das ich geweint hab' sag ihr nicht Auch nicht, dass mein Herz zerbricht" [Don't tell her that I cried, or that my heart is breaking]. But despite all that pain, he still wants her to know, "Sag ihr nur, dass ich sie mag Ich mag sie noch genauso wie am ersten Tag" [Just tell her that I like her, I still like her just like on the first day]. It's a really honest look at how love can linger, even when it's completely over.