1.appetite的基本意思是“欲望”,指人或动物对食物或性的欲望; 用于比喻可指“斗志”等。
2.appetite既可用作可数名词,也可用作不可数名词,有复数形式。

spoil one's appetite
坏了胃口，影响食欲 make sb want to eat less at a meal
Don't have any more chocolate—you'll spoil your appetite.别再吃巧克力了，你会吃不下饭的。

work up an appetite
增强食欲do sth that makes you hungry
Ella had worked up an appetite in the gym.埃拉在健身房锻炼以增强食欲。

My appetite fell off.我的食欲减退了。
It'll whet the appetite.它会增强食欲。
I've lost my appetite.我没有了食欲。
The baby has a good appetite.这个婴儿食欲很好。
The gin killed my appetite.杜松子酒使我食欲大减。
The children all have healthy appetites.孩子们的胃口都很好。
My two sons have enormous appetite.我两个儿子的食欲惊人。
The long walk gave her a good appetite.长途步行让她胃口大开。
He tried to moderate his appetite because he wants to loose weight.他尽力节食，想减轻体重。
He had a notorious sexual appetite.他的性欲是臭名昭著的。
A man must decide either to curb his appetites or surrender to them.一个人必须决定，或抑制其欲念，或向其欲念屈服。
Exercise gave me an appetite.运动促进我的食欲。
All that work on the bicycle has given me an appetite.修自行车费了那么多力气以后我胃口大增。
This restaurant catered to large appetites and modest purses.这家饭馆向胃口很大但囊中羞涩的人供餐。
Sudden decrease in appetite is sometimes a sign of illness.食欲突然减退有时是生病的征兆。
He hasn't got much of an appetite.她胃口不大。
He is a giant of vast appetite.他是个饭量过人的大汉。
He was a person of gross sexual appetites.他是一个性欲旺盛的人。
Classic music is to her appetite.她喜欢古典音乐。
He ate with the appetite of a wolf.他狼吞虎咽。
He ate slowly, without appetite.他没有食欲，吃得很慢。
▲～+prep.-phrase
Her appetite for gossip is absolutely indecent.她爱搬弄是非，极不道德。
Exercises will increase your appetite for food.锻炼身体会增进食欲。
Our son is a football player and has a big appetite for meat.我们的儿子是个橄榄球运动员，吃起肉来胃口很大。
I have no appetite for a big fight.我无意大吵大闹。
They had no appetite for the fight.他们毫无斗志。
She has a great appetite for knowledge.她有强烈的求知欲。
At the moment he had no appetite for work.眼下他不想工作。
He has such a big appetite for reading that you never see him without a book.他是那么酷爱读书，你总是可以看到他手不释卷。
He indulged his appetite to excess.他纵欲无度。

［词源］＜中古英语appetit(强烈要求)