1 (used about metal objects) covered with a brownish substance (rust) as a result of being in contact with water and air （指金属物品）生锈的: rusty tins 生锈的罐子

2 (used about a skill) not as good as it was because you have not used it for a long time （指技能因长期缺乏练习而）生疏的，荒疏的: My French is rather rusty. 我的法语很荒疏了。