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Expresses movement through something from one side to the other. Often used to reinforce 'durch' (through).
Wir mussten durch den engen Tunnel hindurch, um auf die andere Seite des Berges zu gelangen.
We had to go through the narrow tunnel to get to the other side of the mountain.
The word is made up of 'hin' and 'durch'. 'Durch' describes movement through something, while 'hin' emphasizes movement from one point to another. It strengthens the idea of crossing or passing through something completely.
Der Weg führt mitten durch den Wald hindurch.
The path leads right through the middle of the forest.
With spatial movement, 'hindurch' is often used together with the preposition 'durch'. In this structure, 'durch' comes before the place and 'hindurch' comes at the end of the phrase to emphasize the movement.
Wir sind durch das ganze Tal hindurch gewandert.
We hiked through the entire valley.
When it describes a duration of time, 'hindurch' often comes after the noun that indicates the time span. It then functions like a postposition.
Den ganzen Sommer hindurch hat es kaum geregnet.
Throughout the whole summer, it hardly rained.
through / by
'durch' and 'hindurch' can both describe movement from one side to the other. With time, both can also express that something continues for the whole time. 'durch' is the normal preposition and comes before a noun: 'durch den Wald' (through the forest), 'durch die Nacht' (through the night). 'hindurch' is an adverb and emphasizes the movement or duration more strongly. It often appears additionally or after the phrase: 'durch den Tunnel hindurch' (right through the tunnel), 'die ganze Nacht hindurch' (throughout the whole night). Learners may confuse the words because they are very similar. Most of the time, 'durch' is simpler and more common; 'hindurch' sounds clearer or a bit more emphatic.
Wegen des Sturms hörten wir die ganze Nacht hindurch laute Geräusche.
Because of the storm, we heard loud noises throughout the whole night.
Am Morgen fahren wir durch den langen Tunnel.
In the morning, we drive through the long tunnel.