I very recently saw this phrase: 'ar fud na bhfud' meaning all over the place/everywhere and thought that it sounded great. I have a feeling that there are loads of phrases that repeat a word or include rhyming words and so have a more poetic sound than usual.

'Rírá agus ruaille buaille' is one I learned in school; it means a commotion or hullabaloo.

Any others come to mind for anyone?

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Well, there's go deo deo ("forever and ever"), but I'm not sure that's the type of thing you were looking for.

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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 fits the bill too. I know there are loads, but when you try to think of them, they climb into the dark, dark recesses of the mind waiting to be dusted off..... nowhere to be found.

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I recently saw bocht nó nocht "poor or naked" as a way of saying "dirt poor".

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Múinteoir Gaeilge - Irish Teacher
My "specialty" is Connemara Irish, particularly Cois Fhairrge dialect, but I can also speak Ulster and Munster Irish with native-level pronunciation.
Is fearr Gaeilge ḃriste ná Béarla cliste, cinnte, aċ i ḃfad níos fearr aríst í Gaeilge ḃinn ḃeo na nGaeltaċtaí.
Gaeilge Chonnacht (GC), go háraid Gaeilge Chois Fhairrge (GCF), Gaeilic Uladh (GU), Gaelainn na Mumhan (GM), agus Gaeilge an Chaighdeáin Oifigiúil (CO).