mil-KHAY-dek
Here's a breakdown:
* mil: Pronounced like the English word "mill"
* KHAY: Pronounced like the "ch" in the German word "Bach" or the Scottish word "loch"
* dek: Pronounced like the English word "deck"
Important note: The "kh" sound is a guttural sound that's difficult for many English speakers to make. If you're unfamiliar with it, it might be helpful to listen to a native Yiddish speaker pronounce the word.