die Abwertung
devaluation
The official reduction in the value of a currency in relation to other currencies.
Die Abwertung des Dollars machte Importe teurer.
The devaluation of the dollar made imports more expensive.

devaluation / disparagement
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devaluation
The official reduction in the value of a currency in relation to other currencies.
Die Abwertung des Dollars machte Importe teurer.
The devaluation of the dollar made imports more expensive.

The word consists of the prefix 'ab-' (downward) and the noun 'Wertung' (evaluation). An 'Abwertung' (devaluation/disparagement) is therefore a lowering of a value. The ending '-ung' indicates that it is a noun derived from a verb ('abwerten' — to devalue/disparage).
Jede Kritik wurde von ihm als persönliche Abwertung empfunden.
He perceived every criticism as a personal disparagement.
You can recognize the meaning from the context. If it is about 'Währung' (currency), 'Geld' (money), or 'Devisen' (foreign exchange), the economic meaning is intended. If it is about 'Personen' (people), 'Leistung' (performance), 'Arbeit' (work), or 'Kommentare' (comments), the social, belittling meaning is meant.
Die Zentralbank kündigte eine Abwertung der nationalen Währung an.
The central bank announced a devaluation of the national currency.
In the meaning of a currency change, 'Abwertung' (devaluation) is a technical term from economics and finance.
Im Wirtschaftsstudium lernten wir über die Folgen einer Abwertung.
In economics class, we learned about the consequences of a devaluation.
In a social context, people often speak of 'die Abwertung einer Person' (the disparagement of a person), 'die Abwertung von Arbeit' (the devaluation of work), or 'eine verbale Abwertung' (a verbal put-down).
Solche abfälligen Bemerkungen sind eine klare Abwertung seiner Bemühungen.
Such derogatory remarks are a clear disparagement of his efforts.
upgrade / appreciation
'Aufwertung' and 'Abwertung' are opposites. With an 'Aufwertung', the value, reputation, importance, or quality of something increases. With an 'Abwertung', something is made less valuable or less important. Both words are also used in connection with currencies: a currency can be officially appreciated or devalued. Learners may confuse the words because they are built in a similar way. The prefixes help: 'auf-' points upward, so more value; 'ab-' points downward, so less value.

Seine ständige Kritik führte zu einer Abwertung der Arbeit des ganzen Teams.
His constant criticism led to a disparagement of the whole team's work.
Die neuen Bänke und Blumen sorgen für eine deutliche Aufwertung des Platzes.
The new benches and flowers are giving the square a clear upgrade.