reiähtyessä

reiähtyessä is a Finnish verb form derived from the verb reiätä, meaning to perforate or punch holes. It functions as an adverbial participle that marks a time or condition in a clause, and is typically translated into English as “when perforated” or “upon perforation.” The form is most commonly found in technical or procedural texts—such as manufacturing specifications, engineering manuals, and quality-control documentation—where it describes a state or action tied to a perforation event.

Grammatically, reiähtyessä is used to introduce a subordinate clause that describes the circumstances under which another action occurs. It is characteristic of formal or technical Finnish and is less common in everyday speech, where simpler paraphrases such as “kun rei’itys tapahtuu” or “rei’itettynä” might be preferred.

Related terms include reiätys (the act of perforating) and reiät (holes). The form can appear alongside other perforation-related vocabulary in manuals, standards, and product specifications, where precise description of processes and states is required.

In usage, reiähtyessä conveys a conditional or temporal sense linked to the perforation step. When encountered outside technical contexts, it is often replaced with more common expressions to ensure clarity for general audiences.