我知道beat和win，但想到beat和defeat也解释为＂战胜，两者有区别吗？

beat
v.（1）敲打；搏动
You should not beat the boy although he has made a mistake.
My heart is beating fast.
（2）赢，打败
Dick beat John and won the game.
（注意）1.beat作“打”解时，与strike意思相近，beat指“连续地打”，strike指“猛击”。
2.beat作“打败”解时与 defeat （v.击败）是同义词。
3.beat和win都可作“赢”，“胜”解。“赢某人”是beat somebody；“赢一场战斗或比赛”是win a battle （or a game）。

defeat, beat打败，它们的宾语都必须是人或一个集体；team(school, class)等，beat多用于游戏，比赛，defeat尤指战争，有时两词也可互换。
　Tom beat Jim and won the race.
　We beat their team by 10 points.
　I can easily beat him at golf.
　Jacks school beat Toms at baseball.
　Our school defeated that school at football.
　After a year of war it had however been badly defeated.
　The Italian fleet was defeated by the Austrian.