Kävelyssään
Kävelyssään is a Finnish word that translates to "in his/her/their walk" or "during his/her/their walk." It is a grammatical construction formed by combining the noun "kävely" (walk) with the possessive suffix "-nsä" (his/her/their) and the inessive case ending "-ssä" (in). This means the word indicates something occurring within the context of someone's or something's act of walking.
The word is used to describe an action, observation, or state that takes place while a person
It is a common and natural expression in Finnish, used to add detail and context to descriptions