What is the meaning of this sentence:
"Any tiger is a dangerous animal."?
A. A tiger in general is a dangerous animal.
B. Any tiger, even a sick one, is dangerous.
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Yes, you can, but in the context of your second sentence it makes more sense.
Two zoo workers are talking:
A. That old tiger can't be dangerous, it's hardly got any teeth left.
B. Look, any tiger is a dangerous animal. Always treat them with respect.
In a similar way, you can say
While most are not serious, emergency room workers treat any complaint of chest pain as if it might be a heart attack.
This baseball team is a mess. I think, at this point in our terrible season, any win is a major victory.
It could mean either one of your options, and perhaps it could be nuanced a couple other ways as well.
By the way, it's hard to take such a short English sentence and simply ask, "What does this mean?" Native speakers will invariably ask for more context.
I remember an exercise one time where a professor asked us to consider what went through our minds when we heard this sentence:
Mary had a little lamb.
For those who aren't' aware, Mary Had a Little Lamb is an old nursery rhyme and simple song that most people (at least in the US) are first exposed to at a rather early age. So, when we first hear that sentence, most people imagine something like this:
But the class was asked:
In summary, the title of your question asks: Can I say, “Any tiger is a dangerous animal”?
My answer to that is: Absolutely. You can say anything you want. But that one is even grammatical.
You go on to ask: What does it mean?
My answer to that is: It means I'll be careful to avoid tigers – especially at night.
It can and does mean both. But it's a poorly constructed sentence.
To emphasize sentence A:
A tiger is always dangerous.
Here the emphasis is on the verb to be, it implies that whatever state a tiger is in, it is dangerous.
To emphasize sentence B:
Tigers are dangerous animals.
Here the emphasis is on what sort of animal tigers are, i.e., dangerous.