preocupar
worry
pre-
before
+
occupy
to take up (space or time)
+
-ar
verb suffix
Preocupar means to worry and can be thought of as pre-0 (before0) + occupy1 + -ar2 (verb2), suggesting the idea of something occupying your mind beforehand.
verb
- worryTo cause someone to feel anxious or uneasy.No quiero preocupar a mis padres. // I don't want to worry my parents.