verb
Expanding is a present participle form of the verb 'expand', which means to become or make larger or more extensive.
adjective
Expanding can also be used as an adjective to describe something that is increasing in size or scope.
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The company is constantly expanding its operations to new markets.
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The town is expanding rapidly with new housing developments popping up everywhere.
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The party scene is expanding with more clubs opening up in the downtown area.
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Her knowledge of the subject is expanding like a balloon filling up with air.