Guh rav shee-HAWN lyaht
* Guh: A soft "g" sound, like in "go" in English.
* rav: Similar to "rav" in English, but the 'r' is a rolled 'r' if you're familiar with that sound in other languages.
* shee-HAWN: The emphasis is on the second syllable ("HAWN"). The "í" makes a long "ee" sound.
* lyaht: The "t" is a light sound, almost like a soft click at the end.
It's important to note that the pronunciation can vary slightly depending on the speaker's accent and region. However, the above gives a good approximation. Listening to a native speaker pronounce it would be the best way to perfect it. You can easily find audio pronunciations online by searching "Go raibh síocháin leat pronunciation."