The present participle of grubstake; the act of providing supplies or money to a prospector or entrepreneur for a share of profits.
From 'grubstake' (verb) + '-ing' (present participle suffix). The -ing form creates a noun describing the ongoing action or activity.
Grubstaking as an industry shaped America—it funded thousands of prospectors, and the -ing form lets us talk about this whole economic system as an ongoing activity or business practice!
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