1. Third person plural present tense reflexive form indicating that wrinkles decrease, fade, or become less pronounced
With this treatment, wrinkles are diminished over time.
Com este tratamento, diminuem-se as rugas ao longo do tempo.
2. A passive construction used in advertising and cosmetic product descriptions to convey that wrinkles reduce in appearance
The cream claims that wrinkles are reduced with regular use.
O creme afirma que diminuem-se as rugas com o uso regular.