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“Eatarthu” in Irish (between them): Meaning and Where It Comes From

Eatarthu means between them. It is the preposition idir (between) and the pronoun siad (them) joined into one word. Irish does this with every simple preposition; the joined words are called prepositional pronouns, forainmneacha réamhfhoclacha.
Updated October 2026Report a mistake

Where “eatarthu” comes from

Take the preposition, add the pronoun, and they fuse into one word. You never say “idir siad” in Irish.

idirbetween +
siadthem
=
eatarthubetween them

Between: eadrainn = between us. In the singular idir keeps separate words: idir mise agus tusa = between me and you.

“Eatarthu” in the table of “idir”

Every form of idir with a pronoun. Eatarthu is the last (they, them) row. Click any form to see its own page.

PronounIrishMeaningExample
sinn (us)eadrainnbetween usRoinnfimid an cáca eadrainn.We'll share the cake between us.
sibh (you (plural))eadraibhbetween you (plural)Roinnigí an t-airgead eadraibh.Share the money among yourselves.
siad (them)eatarthubetween themNíl mórán difríochta eatarthu.There isn't much difference between them.

“Eatarthu” in sentences

Níl mórán difríochta eatarthu.
There isn't much difference between them.

“siad” with the other prepositions

The same pronoun, siad (them), joined to the other prepositions.

“Eatarthu” in Irish: frequently asked questions

What does eatarthu mean in Irish?

eatarthu means between them: the preposition idir (between) joined to the pronoun siad (them). The next form is eadrainn, between us.

Is eatarthu one word or two?

One word. A simple preposition and a pronoun always fuse in Irish, so you never say “idir siad”. These fused words are prepositional pronouns, forainmneacha réamhfhoclacha.

What are all the forms of idir with pronouns?

eadrainn (between us), eadraibh (between you (plural)), eatarthu (between them).

When do I use eatarthu?

Between: eadrainn = between us. In the singular idir keeps separate words: idir mise agus tusa = between me and you. For example: Níl mórán difríochta eatarthu., There isn't much difference between them.

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