及物动词

1. 使全神贯注；使入神；占据…的思想
If something is preoccupying you, you are thinking about it a lot.

1. engage or engross the interest or attention of beforehand or occupy urgently or obsessively

e.g. His work preoccupies him
The matter preoccupies her completely--she cannot think of anything else

2. occupy or take possession of beforehand or before another or appropriate for use in advance

e.g. the army preoccupied the hills