
runter
down
Colloquial short form of 'herunter' (down); expresses movement from a higher to a lower position.
Kommst du bitte vom Baum runter?
Could you please come down from the tree?
down
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down
Colloquial short form of 'herunter' (down); expresses movement from a higher to a lower position.
Kommst du bitte vom Baum runter?
Could you please come down from the tree?

down
Colloquial for a decrease or reduction, for example in prices, temperatures, or quantities.
Die Benzinpreise sind über Nacht wieder um zwei Cent runter gegangen.
Gas prices went down again by two cents overnight.

down / download
Colloquial for downloading data from the internet or a network.
Ich muss die Fotos noch schnell von der Cloud runter auf meinen Computer ziehen.
I still need to quickly pull the photos down from the cloud onto my computer.

down
Colloquial for a state of emotional or physical exhaustion and dejection.
Nach der langen Arbeitswoche bin ich total runter.
After the long workweek, I'm totally down.
'Runter' is the colloquial and very common short form of 'herunter' (down). In everyday language, 'runter' is almost always used, while 'herunter' sounds more formal.
Holst du mir bitte die Tasse vom Regal runter?
Could you please get the cup down from the shelf for me?
'Runter' often functions like a separable prefix in verbs that describe downward movement (e.g. 'runtergehen' (to go down), 'runterfallen' (to fall down), 'runterkommen' (to come down)). In a main clause, 'runter' then stands at the end of the sentence.
Die Katze kommt den Baum nicht mehr alleine runter.
The cat can't come down from the tree by itself anymore.
When it comes to prices, temperatures, or other values, 'runter' in combination with verbs like 'gehen' (to go) or 'sein' (to be) means a reduction or decrease.
Die Zinsen für Kredite sind wieder etwas runter.
Interest rates for loans are down a bit again.
In a digital context, often with verbs like 'laden' (to load) or 'ziehen' (to pull), 'runter' always means 'herunterladen' (to download).
Ich muss mir die neueste Version der Software runterladen.
I need to download the latest version of the software.
In the combination 'mit etwas runter sein' (to be worn out from something) or 'total runter sein' (to be totally down), the word describes a state of exhaustion or dejection. Here it is used like an adjective after the verb 'sein' (to be).
Nach dem Marathon war ich mit meinen Kräften völlig runter.
After the marathon, I was completely at the end of my strength.
down / downward
Runter and hinunter can both express movement downward. Runter is the colloquial short form and often leaves the exact direction unspecified, while hinunter more precisely marks movement downward and away from the speaker. Use runter in everyday speech and hinunter when this direction is important.

Komm bitte runter in den Hof, dort wartet der Bus auf uns.
Please come down to the courtyard; the bus is waiting for us there.
Geh bitte hinunter in den Hof, dort wartet der Bus auf dich.
Please go down to the courtyard; the bus is waiting for you there.