SIGH-toe-STAIR-ol
Here's a breakdown:
* Sigh: The "si" sounds like the beginning of the word "sigh."
* Toe: The "to" sounds like the word "toe."
* Stair: The "stair" sounds like the word "stair."
* Ol: The "ol" sounds like the end of the word "school."
Let me know if you'd like to practice pronouncing it!