Longman Dictionary of Contemporary English homepage

preoccupy

 verb
     
pre‧oc‧cu‧py past tense and past participle preoccupied, present participle preoccupying, third person singular preoccupies [transitive]
formal if something preoccupies someone, they think or worry about it a lot
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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