I heard people say in the UK
"I want to watch the football."
Is it correct? If it is, did they mean they wanted to watch "the" football as in a specific football match hence the use of the article "the"?
Hello, Jeff2019, and welcome to the Grammar Exchange!
What was the context in which you heard people say that? Did they say it once? If so, what was happening in the surrounding extra-linguistic context when they said it? Did they habitually say it? If so, what were the circumstances in which it was habitually said?
Answers to the above will help us to ascertain the meaning. Once we know the meaning and the context, I will be able to tell you whether the usage is correct in American English. If it isn't correct in American English, then I can try to speculate as to whether speakers of British English might find it correct in that context.