This is the 4592nd most frequent Spanish word.
bajando
"Descending" or "going down."
In this sentence, 'bajando' is the present participle of the verb 'bajar', indicating the action of descending or moving downwards.
Estoy bajando las escaleras.
I am going down the stairs.
Here, 'bajando' is used metaphorically to describe the sun's movement down towards the horizon during sunset.
El sol está bajando en el horizonte.
The sun is setting on the horizon.
In this example, 'bajando' conveys the action of decreasing or lowering the level of something, such as sound.