Vähentämässä
Vähentämässä is the present active participle of the Finnish verb vähentää, meaning to reduce. It denotes the act of reducing that is currently taking place and is used to describe someone who is in the process of reducing something, or to describe an ongoing reduction as part of a larger context.
In Finnish, the present active participle can be formed with -va/-vä or with -massa/-mässä. Vähentämässä belongs
More frequent in everyday language is the finite form vähentää (to reduce) or the nominal form vähentäminen
Related forms include the present active participle vähentävä (reducing), used as an attributive adjective, for example
In summary, vähentämässä expresses an ongoing reduction and is chiefly encountered in formal or technical Finnish,