
sich verschlechtern
to worsen
To become worse; to move into a more negative state.
Sein Gesundheitszustand hat sich über Nacht leider verschlechtert.
Unfortunately, his health condition worsened overnight.
to worsen
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to worsen
To become worse; to move into a more negative state.
Sein Gesundheitszustand hat sich über Nacht leider verschlechtert.
Unfortunately, his health condition worsened overnight.

to worsen
To make something worse; to negatively affect the quality or condition of something.
Zusätzliche Änderungen würden die ohnehin schon angespannte Situation nur noch verschlechtern.
Additional changes would only worsen the already tense situation.
The verb 'verschlechtern' (to worsen) is derived from the adjective 'schlechter' (worse). The prefix 'ver-' here describes the process of changing toward a worse state.
Die Qualität ist jetzt noch schlechter als vorher.
The quality is now even worse than before.
This verb has two important uses: 'sich verschlechtern' (to worsen, reflexive) means that something becomes worse on its own. 'Etwas verschlechtern' (to worsen something, transitive) means that someone or something actively makes a condition worse.
Das Wetter hat sich plötzlich verschlechtert.
The weather suddenly worsened.
In the reflexive form 'sich verschlechtern' (to worsen), typical subjects are impersonal things such as 'die Lage' (the situation), 'die Situation' (the situation), 'das Verhältnis' (the relationship), or 'der Gesundheitszustand' (the health condition).
Die wirtschaftliche Lage im Land hat sich weiter verschlechtert.
The economic situation in the country has worsened further.
to impair
Beeinträchtigen refers to a disruptive or negative effect and does not necessarily claim a clearly measurable deterioration. Verschlechtern more strongly indicates that the condition or quality actually becomes worse. The key question is therefore whether the effect or the result is being emphasized.

Der dauernde Schlafmangel hat die Leistung der Schülerin deutlich verschlechtert.
The student's performance has clearly worsened because of the ongoing lack of sleep.
Wenig Schlaf kann die Leistung der Schülerin beeinträchtigen.
Lack of sleep can impair the student's performance.