Parlay: Turn an initial stake or winnings from a previous bet into (a greater amount) by gambling.
Source: “How the Empire developed after 1815 — primarily as a means to protect British commercial investment and exploitation — and how a small island parlayed an early industrial revolution, supported by large domestic reserves of coal, into one of the largest and most successful empires, commerical, financial and governmental, the world has ever seen, is the primary story of Dawson’s book.”
Source of the source: https://www.goodreads.com/book/show/15793661-unfinished-empire