Dia dhaoibh!

In the run up to Oíche Shamhna, or Hallowe'en, I am researching some older Irish traditions and customs. Along with my Bairín Breac {barmbrack} I have often made parshell's at this time of year, but there was always one part of this tradition that mystified me... It is a very specific word that is shouted out as the old parshell is taken down from above the front door, and the new one is set in its place. I suspect that it is a phonetic interpretation of an original word or phrase, that has since been long forgotten.

The word is: Fonstarensheehy

As a learner, any glimmer of what this word might be is well beyond my comprehension. I am wondering if anyone here might be able to figure out what this might mean? This word is sourced from "The Year in Ireland" by Kevin Danaher, a renowned Folklorist. Any thoughts on what this might mean?

I am wondering also... Does anyone know what "parshell" is, where it stems from? I am wondering if it is a Gaeilge word, or is there a Gaeilge word for it? Since it refers to a cross-making craft, not unlike Bríghid's cross [Cros Bríde, Crosóg Bríde or Bogha Bríde], I thought that maybe "cros" or "crosóg" , might be more apt, but this is the word that is traditionally associated with this craft in folk lore. I would love to figure out the root of it. Any ideas would be greatly appreciated!

Go raibh maith agat!!

According to this web site: https://skelliggiftstore.com/halloween-samhain-irish-customs
it may be from the Irish "Fan istigh ar an sídhe", which they translate as "Stay inside to hinder the fairies". I wasn't sure how they got the "to hinder" part, so I checked FGB, and it does say that the word "ar" can be used to mean "on account of", so that could make the meaning (with the definite article corrected):

Fan istigh ar na sídhe
Stay inside on account of the fairies

I've no idea whether it's relevant to the word parshell, but the Irish word for parsley is peirsil.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

That is awesome! thank you! I am so glad I asked!