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a piece of clothing made to fit the head, often with a brim (= a flat edge that sticks out), usually worn out of doors （常指带檐的）帽子 
a straw/woolly hat 草帽/羊毛帽 to wear a hat 戴帽子 to put on/take off a hat 戴／脱帽子 to have a hat on 戴上帽子
Extra ExamplesTopics Clothes and Fashiona1He placed a battered felt hat on his head. 他把一顶破旧的毡帽扣在头上。 He pulled his hat down over his face. 他把帽子拉下来遮住了脸。 The doorman tipped his hat as we entered. 我们进门时，看门人提了一下帽子向我们致意。 The governor wore a cocked hat trimmed with white feathers. 总督戴着一顶镶有白色羽饰的三角帽。 a riding hat 骑士帽 a top hat 高顶礼帽
Oxford Collocations Dictionaryadjective- broad-brimmed
- wide-brimmed
- floppy
- …
- don
- place
- doff
- …
- be trimmed with something
- box
- shop
- store
- …
- (informal)
a position or role, especially an official or professional role, when you have more than one such role （双重的）职位，角色（尤指官职或职业角色） I'm wearing two hats tonight—parent and teacher. 我今晚身兼两职，既是家长又是老师。 I'm telling you this with my lawyer's hat on, you understand. 你要明白，我是以律师的身份告诉你这事。
see also cocked hat, hi-hat, old hat
Word OriginOld English hætt, of Germanic origin; related to Old Norse hǫttr ‘hood’, also to hood.
Idioms
at the drop of a hat
go hat in hand (to somebody) (especially North American English)
(British English usually go cap in hand (to somebody))
to ask somebody for something, especially money, in a very polite way that makes you seem less important 谦卑地要，恭敬地讨（尤指钱）
hang your hat
- (North American English, informal)
to live in a particular place 居住在；栖居于 These multimillion-dollar homes are more than just a place to hang your hat. 这些价值数百万美元的房子不仅仅是一个挂帽子的地方。
hang your hat on something
- (North American English, informal)
to depend or rely on something 将某事保密 The research is interesting, but you cannot hang your hat on it. 这项研究很有趣，但你不能对它掉以轻心。
my hat
- (old-fashioned)
used to express surprise （表示惊奇）
I’ll eat my hat
I take my hat off to somebody | hats off to somebody (both especially British English)
(North American English usually I tip my hat to somebody)
- (informal)
used to say that you admire somebody very much for something they have done （表示敬佩）
keep something under your hat
- (informal)
to keep something secret and not tell anyone else 将某事保密
knock somebody/something into a cocked hat
- (British English, old-fashioned)
to be very much better than somebody/something 远远胜过某人（或事物）；大大超过；使相形见绌 She knocks the rest of the cast into a cocked hat. 她把其余的演员打得落花流水。
out of a/the hat
if something such as a name is picked out of a/the hat, it is picked at random from a container into which all the names are put, so that each name has an equal chance of being picked, in a competition, etc. 随机抽出
pass the hat round/around
- (informal)
to collect money from a number of people, for example to buy a present for somebody 凑份子（送礼）；凑集金钱
pull something/a rabbit out of the hat
- (informal)
to suddenly produce something as a solution to a problem 突然提出解决方法；突施妙计
talk through your hat
- (old-fashioned, informal)
to say silly things while you are talking about a subject you do not understand 胡说；信口开河；瞎扯
throw your hat into the ring
to announce officially that you are going to compete in an election, a competition, etc. 正式宣布参加竞选（或比赛等）