He is saying that England will endure WW2, even if they are losing in the moment. He is saying that if they do surrender now, England will eventually win.
You can look at the words in front and behind it, because they refer to this big word. You may find a synonym of the word or a close reference. So for example in this sentence: I was excited and ambitious to learn about cars today. So this is a easy example. You can use exited to define ambitious if you dont know what ambitious means.
Answer:
make it seem fun, or bribe them.
