1. 海绵;人造海绵
    Sponge is a very light soft substance with lots of little holes in it, which can be either artificial or natural. It is used to clean things or as a soft layer.

    e.g. ...a sponge mattress.
           海绵床垫

2. 海绵(一种海洋动物，体圆而柔软)
    A sponge is a sea animal with a soft round body made of natural sponge.

3. (洗澡或清洁用的)海绵块
    A sponge is a piece of sponge that you use for washing yourself or for cleaning things.

    e.g. He wiped off the table with a sponge.
           他用一块海绵擦桌子。

4. 用湿海绵擦拭
    If you sponge something, you clean it by wiping it with a wet sponge.

    e.g. Fill a bowl with water and gently sponge your face and body.
           在一只盆里放上水，轻轻地用蘸湿的海绵擦拭你的面部及身体。

5. 海绵蛋糕;松软布丁
    A sponge is a light cake or pudding made from flour, eggs, sugar, and sometimes fat.

sponge的反义词

    e.g. It makes a superb filling for cakes and sponges.
           它非常适合做蛋糕和软布丁的馅儿。

6. 揩…的油;靠…养活
    If you say that someone sponges off other people or sponges on them, you mean that they regularly get money from other people when they should be trying to support themselves.

    e.g. He should just get an honest job and stop sponging off the rest of us!...
           他应该找一份正当的工作，不要再揩我们这些人的油了！
    e.g. He spent his life grumbling about missed opportunities and sponging on his father for money.
           他一辈子都在抱怨失去的机会，并一直伸手向自己的父亲要钱。