离开...,隔着...;在(离岸边不远的)海面
off the coast:在海面上
Examples:
1. They had been wrecked (ie shipwrecked) off the coast of Africa.
他们的船在非洲沿海遇难损毁.
2. After months of drilling, oil was found off the coast.
经数月钻探, 在沿海找到了石油.
3. I look at Cuba, ninety miles off the coast of the United States.
看看古巴，它离美国沿海仅九十英里。
4. It is a lone island off the coast of Guangdong, a mere dot, so to speak, in the South China Sea.
它是广东海岸边的一座孤岛，可说是南海上的一个小点。
这个是词典查的，你可以通过这个地址看off的所有意思。