1
- a person who acts unwisely or imprudently; a silly person傻子, 笨蛋, 莽汉：
I felt a bit of a fool.
我觉得自己有点儿傻。
1.1
- historical a jester or clown, especially one retained in a great household〈史〉（尤指豪门供养的）弄臣, 小丑。
1.2
- archaic a person who is duped or imposed on〈古〉受愚弄（或欺骗）的人; 被利用的人：
he is the fool of circumstances.
他是个受环境摆布的人。
with obj.
1- trick or deceive (someone); dupe愚弄, 欺骗：
she had been fooling herself in thinking she could remain indifferent
她一直自欺欺人地以为自己能不为所动
he fooled nightclub managers into believing he was a successful businessman.
他欺骗夜总会经理, 让他们相信他是个成功商人。
1.1
- no obj. act in a joking, frivolous, or teasing way犯傻; 开玩笑, 戏谑：
I shouted at him impatiently to stop fooling around.
我不耐烦地冲他喊, 叫他别再犯傻了。
1.2
- no obj.
fool around
N. Amer. engage in casual or extramarital sexual activity〈北美〉拈花惹草, 乱搞。
短语
be no （或nobody's） fool
- be a shrewd or prudent person并不傻, 精明。
a fool and his money are soon parted
- proverb a foolish person spends money carelessly and will soon be penniless〈谚〉蠢人不积财。
fools rush in where angels fear to tread
- proverb people without good sense or judgement will have no hesitation in tackling a situation that even the wisest would avoid〈谚〉智者三思之事蠢人急不可待。
make a fool of
1
- trick or deceive (someone) so that they look foolish愚弄, 欺骗（某人）。
1.1
make a fool of oneself
behave in an incompetent or inappropriate way that makes one appear foolish出丑。
more fool -
- used as an exclamation indicating that a specified person is unwise to behave in such a way（某人那样做）真傻：
if suckers will actually pay to do the work, more fool them.
如果有笨蛋真愿花钱做那种事, 那真是傻透了！
play（或act）the fool
- behave in a playful or silly way扮丑角, 逗人笑; 做傻瓜, 干蠢事。
there's no fool like an old fool
- proverb the foolish behaviour of an older person seems especially foolish as they are expected to think and act more sensibly than a younger one〈谚〉老人做的蠢事最愚蠢。
you could have fooled me!
- used to express cynicism or doubt about an assertion你别骗我啦！（对别人说法表示嘲讽或怀疑）：
'Fun, was it? Well, you could have fooled me!'
“有趣, 是吗？得了, 别骗我啦！”
词源
Middle English: from Old French fol 'fool, foolish', from Latin follis 'bellows, windbag', by extension 'empty-headed person'.