to replace / remove
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to replace
To replace someone in an activity or position, especially after a certain period of time.
Die Nachtschicht wird um 6 Uhr morgens von der Frühschicht abgelöst.
The night shift is replaced by the early shift at 6 a.m.
'Ablösen' (to replace/remove) is a separable verb. The prefix 'ab-' separates from the verb stem 'lösen' (to loosen/solve) in a main clause and goes to the end. Here, the prefix 'ab-' strengthens the idea of removing or separating.
Der neue Direktor löst den alten im Januar ab.
The new director replaces the old one in January.
You can recognize the meaning from the object: if it is a person, 'ersetzen' (to replace) is meant. If it is an object, it is about 'entfernen' (to remove). With financial terms like 'Kredit' (loan), it means 'bezahlen' (to pay). If the verb is reflexive ('sich ablösen'), something comes off by itself.
Die Wache wird um Mitternacht abgelöst.
The guard is replaced at midnight.
In the meaning 'jemanden ersetzen' (to replace someone), 'ablösen' (to replace) is often used in work contexts. Typical formulations are 'die Nachtschicht ablösen' (to relieve/replace the night shift) or 'einen Kollegen bei der Arbeit ablösen' (to take over for a colleague at work).
Ich muss früher gehen, kannst du mich für die letzte Stunde ablösen?
I have to leave early; can you take over for me for the last hour?
When something comes off by itself, the verb is used reflexively: 'sich ablösen' (to come off). The surface that something comes off from is indicated with the preposition 'von' + dative.
Die alte Tapete löst sich schon von den Wänden ab.
The old wallpaper is already coming off the walls.
In finance, 'ablösen' (to pay off) means the complete repayment of a larger debt. People talk about 'einen Kredit ablösen' (to pay off a loan) or 'eine Hypothek ablösen' (to pay off a mortgage).
Sie haben hart gespart, um den Baukredit vorzeitig ablösen zu können.
They saved hard so they could pay off the construction loan early.
to remove
'entfernen' and 'ablösen' can both mean that something is removed. 'entfernen' is more general: you can remove dirt, a file, or an object. 'ablösen' is especially fitting when something is stuck or attached to a surface and you take it off from there. It often sounds more precise when you carefully remove a label, a bandage, or wallpaper from something. Memory tip: everything you 'ablösen' is also something you 'entfernen', but not everything you 'entfernen' is something you 'ablösen'.
Clara löst das Etikett vorsichtig von der Flasche ab.
Clara carefully removes the label from the bottle.
Wir entfernen heute die alten Nachrichten aus dem Gruppenchat.
We are removing the old messages from the group chat today.