If someone is a defender of a particular thing or person that has been criticized, they argue or act in support of that thing or person.
例句
...the most ardent defenders of conventional family values.传统家庭价值观最热烈的捍卫者...a strong defender of human rights or religious freedom.人权或宗教自由的坚强卫士
N-COUNT
(足球、曲棍球等运动中的)防守队员，防守球员
A defender in a game such as football or hockey is a player whose main task is to try and stop the other side scoring.
英汉词典释义
n.
防御者;守卫者;保护者;辩护者
The defender argued down the prosecutor at the court.辩护人在法庭上驳倒了起诉人。
<体>卫冕者;防守队员
He shouldered off a defender and shot at goal.他用肩膀挡开防守队员,然后射门。Our best defender is injured and won’t be able to play today.我们最佳的防守队员受伤了,今天不能参加比赛。The defender kicked the ball out of play.防守队员把球踢出界外。The goalkeeper was injured so a defender had to go in goal.守门员受伤了，只好由一名防守队员来守门。The team’s secret weapon was their new young defender.这个队的秘密武器就是刚来的年轻防守队员。This defender’s ability to score vital goals has often proved a trump card.这名防守队员在关键时刻进球得分的能力常常成了整个队的制胜法宝。