
der Bart
beard
All the hair that grows on men's faces, especially on the chin, cheeks, and upper lip.
Er trägt einen Vollbart, den er regelmäßig pflegt.
He has a full beard that he takes care of regularly.
beard
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beard
All the hair that grows on men's faces, especially on the chin, cheeks, and upper lip.
Er trägt einen Vollbart, den er regelmäßig pflegt.
He has a full beard that he takes care of regularly.

key bit
The part of a key that has a specific shape in order to fit into the lock and operate the locking mechanism.
Der alte Schlüssel passt nicht, weil der Bart zu breit für das Schloss ist.
The old key doesn't fit because the bit is too wide for the lock.

beard / awn
Threadlike or bristly appendages on animals or plants, for example on mussels, fish, or ears of grain.
Die langen Bärte der Gerstenähren wiegten sich im Wind.
The long awns of the barley ears swayed in the wind.
The main meaning is facial hair. The other meanings are metaphorical and become clear from context. If a 'Schlüssel' (key) or 'Schloss' (lock) is mentioned, the technical part is meant. With 'Pflanzen' (plants) or 'Tieren' (animals), the bristly appendages are meant.
Der Schlüsseldienst musste das Schloss austauschen, weil der Bart des alten Schlüssels abgebrochen war.
The locksmith had to replace the lock because the bit of the old key had broken off.
In connection with facial hair, the most common verbs are 'einen Bart tragen' (to wear/have a beard), 'sich einen Bart wachsen lassen' (to grow a beard), and 'sich den Bart rasieren' (to shave one's beard) or 'den Bart stutzen' (to trim the beard).
Er hat sich entschieden, sich einen Bart wachsen zu lassen.
He has decided to grow a beard.
'Bart' (beard) is the base word for many different types of beards. Examples are 'der Vollbart' (full beard), 'der Spitzbart' (goatee/pointed beard), 'der Kinnbart' (chin beard), or 'der Dreitagebart' (three-day stubble).
Für die Rolle im Film musste er sich einen Vollbart zulegen.
For the role in the film, he had to grow a full beard.
leaf / sheet
When referring to a key, Blatt can denote the entire flat section, while Bart refers to the specially shaped part that operates the locking mechanism. The appropriate choice therefore depends on whether the entire flat section or only its locking profile is meant.

Der Bart des alten Schlüssels passt nicht mehr genau in das Schloss.
The bit of the old key no longer fits the lock precisely.
Das Blatt des alten Schlüssels ist leicht verbogen.
The blade of the old key is slightly bent.