Usage Note
Zähneknirschen is the noun (das Zähneknirschen) for the involuntary grinding of teeth, especially during sleep. The verb is mit den Zähnen knirschen. Also used figuratively for suppressed anger: mit Zähneknirschen (grudgingly).
Examples
"Das nächtliche Zähneknirschen schädigt auf Dauer den Zahnschmelz."
Natural Translation
Nightly teeth grinding damages the tooth enamel over time.
Literal Translation
The nightly teeth-grinding damages over time the tooth-enamel.

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