The word "preoccupied" is an adjective that describes someone who is so focused on something that they are not paying attention to other things around them. When a person is preoccupied, they might seem lost in their thoughts or overly concerned with a particular issue.
You can use "preoccupied" when you want to describe someone who is distracted or mentally absorbed in something, often to the point where they might not notice what is happening around them.
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While there are no direct idioms that use "preoccupied," you might use the phrase "lost in thought" to convey a similar idea.
There are no specific phrasal verbs associated with "preoccupied," but you might say someone "got caught up" in their thoughts, which conveys a similar meaning.
In summary, "preoccupied" describes a state of being deeply absorbed in thoughts or concerns, often to the point of distraction. It can apply to various situations, such as work, personal issues, or even hobbies.