Fòram na Gàidhlig

Since I moved here, all my colleagues say this phrase when they’ve done something, so I associate it with “that’s it!” or “all done!”
Yesterday this phrase came out of my mouth too and it felt both natural and weird, as a language I’m so unfamiliar with is creeping into my normal day do day talk.
I wanted to tell my Italian friends about it as I’m on a Facebook group of Italians who love Scotland... but I don’t know how to write it!!!
Now... sorry if it seems silly... the phrase sounds something like “anakatà” I feel silly even for spelling it like it sounds, but I don’t know how else to explain it!!

Sin agad e.

Tapadh leat! I could have never guessed that!!

Pronunciation is something like: Shin akuht eh (in English spelling) but in colloquial speech the "sin (shin)" is often lenited and pronounced "Hin". This is pelled Shin agad e! (which is not pronounced like "sh" in English)...

Yep, it's a very common phrase which can mean "there it is", "there you have it" etc.