A hint is a slight indication or clue. Your mother might hint at the fact that she doesn’t like your shoes, while your grandmother will just come right out and say that they’re ugly.
If you’re a journalist following a lead, you’ll prefer that your source give you all the facts, rather than just a hint. A hint can be an indirect suggestion and it is also a very small amount — maybe you take just a hint of sugar in your coffee. As a verb, hint is an intimation or subtle suggestion. It’s also something you drop, like when you hint that you want a particular video game for your birthday.