
abladen
to unload
To remove a load or freight from a vehicle or means of transport.
Der LKW-Fahrer muss den Sand auf der Baustelle abladen.
The truck driver has to unload the sand at the construction site.
to unload / dump
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to unload
To remove a load or freight from a vehicle or means of transport.
Der LKW-Fahrer muss den Sand auf der Baustelle abladen.
The truck driver has to unload the sand at the construction site.

to dump
Colloquial for disposing of trash or unwanted things, often in a place not intended for that purpose.
Es ist verboten, alten Bauschutt einfach im Wald abzuladen.
It is forbidden to simply dump old construction debris in the forest.

to unload
In a figurative sense, to get rid of one's worries, problems, or responsibility with another person by talking about them or transferring them.
Er hat bei mir seinen ganzen Frust über die Arbeit abgeladen.
He unloaded all his frustration about work on me.
'Abladen' (to unload / dump) is a separable verb. The prefix 'ab-' stands at the end in main clauses. In subordinate clauses or in the infinitive with 'zu,' the verb stays together.
Der Bauer lädt das Heu vom Wagen ab.
The farmer unloads the hay from the wagon.
The verb has a literal meaning (taking freight off a truck) and a figurative one (getting rid of problems by putting them on someone else). The object makes the difference: 'Sand abladen' (to unload sand) is literal; 'Frust abladen' (to unload frustration) is figurative.
Kannst du mir helfen, die Einkäufe aus dem Auto abzuladen?
Can you help me unload the groceries from the car?
In connection with trash, 'abladen' (to dump) has a negative, colloquial meaning. It often implies that something is disposed of illegally or in an inappropriate place.
Wer hat seinen alten Fernseher einfach hier am Straßenrand abgeladen?
Who just dumped their old TV here by the side of the road?
In the figurative meaning, the person who has to listen to the problems is named with the preposition 'bei' and the dative. The structure is: something (accusative) bei jemandem (dative) abladen.
Nach einem schlechten Tag hat er seinen ganzen Ärger bei seiner Freundin abgeladen.
After a bad day, he unloaded all his anger on his girlfriend.
to deport / shift off
Both words can be used figuratively to mean getting rid of something burdensome by passing it on to someone else. „Abschieben“ emphasizes passing on responsibility or a task, while „abladen“ can also mean getting rid of worries and problems by talking about them. „Abschieben“ fits a task, while „abladen“ is often used for personal worries.

Nach dem Streit lud sie ihre Sorgen bei ihrer besten Freundin ab.
After the argument, she unloaded her worries on her best friend.
Nach dem Fehler versuchte der Mitarbeiter, die Verantwortung auf seine Kollegin abzuschieben.
After the mistake, the employee tried to shift the responsibility onto his colleague.