expansion noun

/ɪkˈspæn.t ʃən/ n [C or U]

Definition

when something increases in size, number or importance

the rapid expansion of the software industry

Expansion into new areas of research is possible.

an expansion of industry

(Definition of expansion noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

If a problem preys on your mind, you think about it and worry about it a lot

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