słownik polsko - angielski
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obniżać wartość po angielsku:
1. 
devalue
The pound has been devalued, so we’ll get more euros.
devalue /ˌdi:ˈvælju:; US / verb [transitive] 1 to reduce the value of the money of one country in relation to the value of the money of other countries The pound has been devalued against the dollar. ▶ dewaluować
Angielskie słowo "obniżać wartość" (devalue) występuje w zestawach:
BUSSINES ENGLISH2. 
depreciate
You depreciate them by this comment.
New computers depreciate in value very quickly.