How do you pronounce modus operandi?

moh-dəs op-ə-ran-ˌdī

Here's a breakdown:

* moh-: like the word "mo"

* dəs: like the word "does"

* op-: like the word "op"

* ə-ran-: like the word "errand"

* ˌdī: like the word "die"

It's often shortened to "M.O." in informal settings.