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1. To be victorious; to achieve success. I was confident from the very beginning that our team would win through. It turns out our department won through in terms of overall sales, which is pretty cool to hear.
2. To be victorious or achieve success because of some specific factor or by some particular method. In this usage, a noun or pronoun can be used between "win" and "through." If you have to win through cheating, then you haven't really won anything at all. Though they were considered underdogs, their team won the championship through sheer hard work and determination.
win through something
to succeed by a certain method or procedure. Winning is no good if you have to win through dishonesty. Sally won through her own hard work.
Also, win the day. End successfully, be victorious, as in We didn't know until the very end if they would win through, or It seems that hard work won the day. The first term dates from the late 1800s and today is more often put as come through (def. 1). The variant originally alluded to the outcome of a battle and dates from the late 1500s.
Chiefly British To overcome difficulties and attain a desired goal or end: The soccer team won through to the finals.