Here's a breakdown:
* Mo: Pronounced like the English word "mo", but with a slight emphasis on the "o".
* Cuishle: Pronounced KOO-shla, with the "sh" sound similar to the "sh" in "ship".
The "c" in "cuishle" is pronounced like a "k", not a "s" sound.
It's a very romantic and affectionate phrase that is often used in Irish songs and poetry.