voimistuu
Voimistuu is the present tense, third-person singular form of the Finnish intransitive verb voimistua. It denotes that something is becoming stronger, more powerful, or more intense. The sense can be physical, as when fitness or muscle strength improves, or abstract, as when a situation or trend grows more pronounced.
The verb is commonly used with nouns related to growth or intensity, such as kunto, lih personality?
Related forms include voimistuin (I became stronger), voimistuit (you became stronger), voimistui (he/she/it became stronger) in
See also terms include vahvistua, which can be used similarly to mean to become stronger, and voimistelu,