
absenken
to lower
To bring or move something into a lower position; to let something down.
Der Kranführer senkte die schwere Last langsam ab.
The crane operator slowly lowered the heavy load.
to lower
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to lower
To bring or move something into a lower position; to let something down.
Der Kranführer senkte die schwere Last langsam ab.
The crane operator slowly lowered the heavy load.

to sink / subside
To sink to a lower level or tilt downward. This can refer to the ground, a structure, or also the water level.
Durch den Bergbau hat sich der Boden in dieser Region um mehrere Meter abgesenkt.
Because of mining, the ground in this region has subsided by several meters.

to lower / reduce
To reduce or decrease something, for example a temperature, a price, or a level.
Um Energie zu sparen, sollten wir die Raumtemperatur nachts absenken.
To save energy, we should lower the room temperature at night.
'Absenken' (to lower) is a separable verb. In a main clause, the prefix 'ab' comes at the end. In subordinate clauses and in the infinitive with 'zu', the verb stays together.
Der Pilot senkt das Flugzeug langsam ab.
The pilot slowly lowers the airplane.
The use of the verb changes its meaning. When a person or machine actively 'etwas absenkt' (lowers something), it needs an accusative object. When 'sich etwas absenkt' (something sinks/subsides), the process happens by itself and the verb is reflexive.
Wir senken die Preise für alle Produkte ab.
We are lowering the prices for all products.
The object helps you recognize the meaning. If it is a concrete, physical object like 'eine Last' (a load) or 'ein Boot' (a boat), the literal meaning is intended. With abstract objects like 'Temperatur' (temperature), 'Niveau' (level), or 'Stimme' (voice), it is about a reduction.
Die Rettungskräfte senkten die Trage vorsichtig ab.
The rescue workers carefully lowered the stretcher.
In the figurative meaning 'reduzieren' (to reduce), 'absenken' (to lower/reduce) is often combined with abstract nouns. Typical examples are: 'die Temperatur absenken' (to lower the temperature), 'die Preise absenken' (to lower prices), 'das Fieber absenken' (to bring down a fever), or 'die Erwartungen absenken' (to lower expectations).
Die Zentralbank hat den Leitzins nicht abgesenkt.
The central bank did not lower the key interest rate.
to sink / fall
When a water level or another level becomes lower, both sinken and sich absenken can be appropriate. Sinken describes the change without emphasizing a cause, while sich absenken places more emphasis on moving down to a lower level. Sinken is appropriate for a development that occurs on its own; for an intentionally caused change, absenken is appropriate.

Die Arbeiter senkten den Wasserspiegel nach dem starken Regen langsam ab.
The workers slowly lowered the water level after the heavy rain.
Der Wasserspiegel sank nach dem starken Regen langsam.
The water level fell slowly after the heavy rain.