This should obviously be "lose", now the problem though is I'm not able to find the exact source of the spelling error, MyAnimeList references Next-episode.net: https://myanimelist.net/anime/263/Hajim ... episode/19Kobashi abandoned his strategy and looses the match to Ippo via K.O.
But that doesn't seem like much of an authoritative source in itself.
The wikipedia page for the show doesn't have a description listed for that episode: https://en.wikipedia.org/wiki/List_of_H ... o_episodes
The show was licensed in the West by Geneon Entertainment far as I can tell who have ceased to exist in their original form so you'd be hard pressed to find their descriptions (which would be the official descriptions) unless you have the original DVD box-set.
Is it worth fixing the spelling mistake with this lack of information?