In TYI there is the sentence

Sheasaíos ag an ndroichead agus bhíos ag féachaint ar na breacaibh san uisce thíos fúm.
which translates as
I stood at the bridge and I watched the fish down below me in the water.


but the word Breacaibh, its actually the Dative of Breac, Trout ?
due to the ar proceeding it?

Nothing came up online or my dictionary's for Breacaibh.

also thíos fúm. Thíos is below and Fúm is below, so why include both ?
Is it Like in English where you might say, its down under the stairs?

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Bíonn rudaí maithe mall

You are correct: breacaibh is the dative plural of breac.

Probably not used much outside Munster any more but it does have a lovely sound to it.


I don't think it would be strange at all to say down below me in English.

And the opposite, "up above me", would be thuas os mo chionn

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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).

Excellent, its always nice to get clarification, just in case God forbid I was to make a mistake when talking to someone.

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Bíonn rudaí maithe mall

God forbid! Cos there ain't nobody makin' mistakes when they be speaking English.

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I don't never make no mistakes in English! (and if you believe that, I've got this beach-front property in Arizona I'd love to sell you!)

All laughing aside, though, you don't want to get too hung up on worrying about mistakes, or it can keep you from talking at all, and that's never a good thing! Speaking "live" is very different from reading and writing, and, let's face it, you WILL make mistakes. It's the nature of the beast. Nobody minds. It's part of the learning process. You just have to take them in good humor and learn from them.

Redwolf

I think Daithí was joking!

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I was, sure i make mistakes in English all the time, and its my native language.

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Bíonn rudaí maithe mall

Breandán has already explained it's the dative plural.

It isn't used much anymore except for:

Fixed phrases:
dá bhonnaibh Off his feet
ar chúlaibh an tí at the back of the house
tríd a shúilibh through his eyes
ó chiannaibh a while ago
thar na beartaibh amazing

Counting for some measure words like bliain, ceann, céad and punt:
ocht nó naoi do bhlianaibh eight or nine years
cúig nó sé chéadaibh five or six hundred

Only for bó and bean is it occasionally used elsewhere:
leis na mnáibh with the women
ar na buaibh on the cows

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The dialect I use is Cork Irish.
Ar sgáth a chéile a mhairid na daoine, lag agus láidir, uasal is íseal

Bíonn adharca fada ar na buaibh thar lear

Is there a word or two (or three or four) missing there? "used much any more", for example?

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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).