syttyy
Syttyy is a Finnish verb, the present tense third-person singular form of syttyä, meaning to catch fire or to ignite. It describes events in which something becomes lit, such as a lamp or a fire, and it can also be used figuratively to indicate that a situation begins to flare up or intensify.
Typical usage is intransitive, with no direct object: Lamppu syttyy, kun kytkin on päällä. Tuli syttyi eilen
Related forms in the syttyä verb family include syttyminen (the act of ignition) and other inflected forms