Old English. Cognate with or formed similarly to Middle Dutch overwinnen (Dutch overwinnen), Old High German ubarwinnan (Middle High German überwinnen) from the Germanic base of over- + the Germanic base of win.
Definition of overwin in US English:
overwin
verbˌəʊvəˈwɪn
with objectTo overcome; to conquer, vanquish.
Origin
Old English. Cognate with or formed similarly to Middle Dutch overwinnen (Dutch overwinnen), Old High German ubarwinnan (Middle High German überwinnen) from the Germanic base of over- + the Germanic base of win.