Starving means being extremely hungry and unable to eat because you don't have food or money.
When people talk about being starving, they often mean it literally - that they haven't eaten for a long time. Imagine walking into school without any breakfast because your mom couldn't afford to buy milk and bread. You might feel lightheaded, dizzy, and just plain hungry. This is what people usually mean when they say someone's starving.
It can also be used in a more figurative way - like if you're really craving something delicious but can't have it. For example, "I'm starving for ice cream" doesn't mean your stomach is growling, but rather that you desperately want to eat some ice cream. This use of the word is usually informal and used among friends or in casual conversations.
present participle and gerund of starve
