1.总的；总体的；全面的You useoverall to indicate that you are talking about a situation in general or about the whole of something.

e.g. ...theoverall rise in unemployment...失业率总体的上升e.g. Cut down youroverall amount of physical activity...减少体力活动的总量。

2.（上下连身的）工作服，防护服Overalls consist of a single piece of clothing that combines trousers and a jacket. You wear overalls over your clothes in order to protect them while you are working.

e.g. ...workers in blue overalls.穿着蓝色连身工作服的工人

3.（吊带）工装裤Overalls are trousers that are attached to a piece of cloth which covers your chest and which has straps going over your shoulders.

e.g. An elderly man dressed in faded overalls took the witness stand.一位穿着褪色吊带工装裤的老人上了证人席。

4.（工作时穿的）罩衣Anoverall is a piece of clothing shaped like a coat that you wear over your clothes in order to protect them while you are working.