Definition from macmillandictionary.com
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a child with a healthy appetite
The symptoms include fever and loss of appetite.
All that fresh air and exercise has given me an appetite.
Don’t have any more chocolate – it’ll spoil your appetite (=make you want to eat less at the next meal).
Ella had worked up an appetite in the gym.
The public’s appetite for celebrity gossip seems insatiable.
He is portrayed as having an immense sexual appetite.