
trüben
to cloud
To make a clear liquid opaque or unclear.
Der aufgewirbelte Sand trübte das klare Wasser des Sees.
The stirred-up sand clouded the clear water of the lake.
to cloud / to spoil
Loading your saved state.

to cloud
To make a clear liquid opaque or unclear.
Der aufgewirbelte Sand trübte das klare Wasser des Sees.
The stirred-up sand clouded the clear water of the lake.

to spoil
To negatively affect or worsen a positive mood, a good relationship, or a pleasant situation.
Der Streit über das Geld trübte ihre langjährige Freundschaft.
The argument about the money spoiled their long-standing friendship.

to become cloudy
To become cloudy or overcast (weather), or to lose clarity (one's gaze, mood).
Gegen Abend trübte sich der Himmel und es sah nach Regen aus.
Toward evening, the sky became cloudy and it looked like rain.
The verb 'trüben' (to cloud/to spoil) is closely related to the adjective 'trüb' (cloudy, murky, gloomy). When something 'sich trübt' (becomes cloudy), it becomes 'trüb' (unclear, cloudy, gloomy).
Das Wasser wurde nach dem Sturm ganz trüb.
The water became completely murky after the storm.
The subject or object reveals the meaning. If it is about liquids ('Wasser' = water), the literal meaning is intended. With abstract nouns ('Stimmung' = mood, 'Freude' = joy), the figurative meaning is intended. With 'Himmel' (sky) or 'Blick' (gaze), the reflexive form is used.
Ein Löffel Mehl trübt die klare Suppe.
A spoonful of flour clouds the clear soup.
In the figurative meaning, 'trüben' (to spoil) is often used with abstract nouns such as 'die Stimmung' (the mood), 'die Freude' (the joy), 'die Beziehung' (the relationship), or 'die Aussichten' (the prospects).
Der Regen konnte unsere gute Stimmung nicht trüben.
The rain could not spoil our good mood.
The reflexive form 'sich trüben' (to become cloudy/to cloud over) is often used for the weather or facial expression. It describes a process of becoming unclear or gloomy.
Der Himmel trübte sich und die Sonne verschwand.
The sky became cloudy and the sun disappeared.
to spoil / ruin
Both verbs can indicate that an event negatively affects a good mood or someone’s enjoyment. „Trüben“ usually sounds milder: the positive situation is weakened. „Verderben“ more often indicates that the enjoyment or the whole situation is seriously affected.

Der kurze Streit trübte unsere Freude an der Feier.
The brief argument clouded our enjoyment of the celebration.
Der Streit verdarb uns die Freude an der Feier.
The argument spoiled our enjoyment of the celebration.