IPA: /priˈɒkjʊpaɪ/
KK: /priˈɑkjəˌpaɪ/
To completely fill someone's mind or attention so that they cannot think about anything else.
The mystery novel preoccupied her thoughts for days.
Past: preoccupied
Past Participle: preoccupied
Preoccupy → It is formed from "pre-" (meaning before) and "occupare" (meaning to seize or take). The word "preoccupy" means to seize or take possession of something before it is available or to occupy one's mind beforehand.
Think of something being 'taken' ('occupare') 'before' ('pre-') it is available — that's why preoccupy means to occupy your mind with something in advance.