
befestigen
to attach
To attach something to another thing so that it sits firmly and does not come loose easily.
Er befestigte das Bild mit einem Nagel an der Wand.
He attached the picture to the wall with a nail.
to attach / fortify
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to attach
To attach something to another thing so that it sits firmly and does not come loose easily.
Er befestigte das Bild mit einem Nagel an der Wand.
He attached the picture to the wall with a nail.

to fortify
To strengthen and secure a place, such as a city or castle, militarily through walls or other structures.
Im Mittelalter wurden die Städte stark befestigt, um sich vor Feinden zu schützen.
In the Middle Ages, cities were heavily fortified to protect themselves from enemies.

to strengthen
To consolidate and strengthen something abstract, such as a relationship, a position, or a reputation.
Durch den Wahlsieg konnte die Partei ihre Machtposition weiter befestigen.
Through the election victory, the party was able to further strengthen its position of power.
The verb is made up of the prefix 'be-' and the adjective 'fest' (firm). It literally means 'to make something firm'. This logic applies to all meanings: to make a shelf firm, to make a castle firm, or to make a relationship firm.
Er befestigte das Seil an einem dicken Ast.
He attached the rope to a thick branch.
The prefix 'be-' is inseparable. It remains firmly attached to the verb stem in all tenses and sentence constructions.
Sie hat das Regal sicher an der Wand befestigt.
She securely attached the shelf to the wall.
When saying where something is attached, you usually use the preposition 'an' with the dative. The pattern is: etwas (accusative) an etwas (dative) befestigen.
Die Lampe wird direkt an der Decke befestigt.
The lamp is attached directly to the ceiling.
The object of the verb reveals the meaning. If it is an object (e.g., sign, mirror), attaching is meant. With a place (e.g., city, fortress), it is about military protection. With an abstract noun (e.g., power, friendship), strengthening is meant.
Der neue Spiegel muss noch im Bad befestigt werden.
The new mirror still has to be attached in the bathroom.
to secure / save
When transporting goods, both sichern and befestigen can be used. Sichern emphasizes protecting the load from shifting or falling. Befestigen, by contrast, describes firmly connecting the load to the loading surface or another support.

Der Fahrer befestigt die Kisten mit Gurten auf der Ladefläche.
The driver attaches the crates to the loading platform with straps.
Der Fahrer sichert die Kisten mit Gurten gegen das Verrutschen.
The driver secures the crates with straps to prevent them from shifting.