Upwardly mobile
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Any person who is in the process of moving above their current social or economic status (i.e. from lower to [middle class]).
A [hustler] that constantly [seeks] to improve their social or economic standing
Upwardly mobile meaning & definition 1 of Upwardly mobile.
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moving or able to move to a higher social class, for example by becoming richer:
Upwardly mobile meaning & definition 2 of Upwardly mobile.