to rattle / chatter
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to rattle
To produce a repeated, short, hard, and often irregular noise that occurs when solid objects loosely strike against each other.
Die alten Fensterläden klapperten die ganze Nacht im Wind.
The old shutters rattled in the wind all night.
to chatter one's teeth
An uncontrolled, trembling striking together of the teeth, usually caused by cold or great fear.
Mir war so kalt, dass ich am ganzen Körper zitterte und mit den Zähnen klapperte.
I was so cold that my whole body was shaking and my teeth were chattering.
advertising is part of the job
An idiom that says it is necessary to draw attention to yourself and your achievements (that is, to advertise) in order to be successful.
Sie erzählt jedem von ihrem neuen Projekt, aber klappern gehört eben zum Handwerk.
She tells everyone about her new project, but advertising is just part of the job.
'Klappern' (to rattle) is an onomatopoeic word. The sound of the word imitates the noise it describes—a short, hard striking together.
Ich hörte die Tasten der alten Schreibmaschine klappern.
I heard the keys of the old typewriter rattling.
In this meaning, the thing that makes the noise is the subject of the sentence. The cause of the noise is often added with a preposition, such as 'im Wind' (in the wind).
Das Geschirr klapperte auf dem Tablett.
The dishes rattled on the tray.
The expression 'mit den Zähnen klappern' (to chatter one's teeth) is fixed. The person who is freezing or afraid is the subject of the sentence.
Er stand nur im T-Shirt draußen und klapperte vor Kälte mit den Zähnen.
He stood outside wearing only a T-shirt and chattered his teeth from the cold.
The expression 'Klappern gehört zum Handwerk' (advertising is part of the job) is a proverb. It is used to justify talking about your own successes or promoting yourself.
Er lobt seine eigene Arbeit ständig, aber er sagt immer: Klappern gehört zum Handwerk.
He constantly praises his own work, but he always says: Advertising is part of the job.
