pysähtyisi
Pysähtyisi is the conditional form of the Finnish verb pysähtyä. The verb pysähtyä means "to stop," "to halt," or "to pause." The conditional mood in Finnish expresses hypothetical situations, possibilities, or wishes. Therefore, pysähtyisi literally translates to "would stop," "would halt," or "would pause."
This form is used when talking about something that might happen under certain conditions, but is not
The verb pysähtyä itself can be used in various contexts, from a vehicle coming to a stop