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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 （常指帶檐的）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／脫帽子 to have a hat on 戴上帽子
Extra ExamplesTopics Clothes and Fashiona1He placed a battered felt hat on his head. 他把一頂破舊的氈帽扣在頭上。 He pulled his hat down over his face. 他把帽子拉下來遮住了臉。 The doorman tipped his hat as we entered. 我們進門時，看門人提了一下帽子向我們致意。 The governor wore a cocked hat trimmed with white feathers. 總督戴着一頂鑲有白色羽飾的三角帽。 a riding hat 騎士帽 a top hat 高頂禮帽
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 （雙重的）職位，角色（尤指官職或職業角色） I'm wearing two hats tonight—parent and teacher. 我今晚身兼兩職，既是家長又是老師。 I'm telling you this with my lawyer's hat on, you understand. 你要明白，我是以律師的身份告訴你這事。
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 謙卑地要，恭敬地討（尤指錢）
hang your hat
- (North American English, informal)
to live in a particular place 居住在；栖居於 These multimillion-dollar homes are more than just a place to hang your hat. 這些價值數百萬美元的房子不僅僅是一個挂帽子的地方。
hang your hat on something
- (North American English, informal)
to depend or rely on something 將某事保密 The research is interesting, but you cannot hang your hat on it. 這項研究很有趣，但你不能對它掉以輕心。
my hat
- (old-fashioned)
used to express surprise （表示驚奇）
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 將某事保密
knock somebody/something into a cocked hat
- (British English, old-fashioned)
to be very much better than somebody/something 遠遠勝過某人（或事物）；大大超過；使相形見绌 She knocks the rest of the cast into a cocked hat. 她把其餘的演員打得落花流水。
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. 随機抽出
pass the hat round/around
- (informal)
to collect money from a number of people, for example to buy a present for somebody 湊份子（送禮）；湊集金錢
pull something/a rabbit out of the hat
- (informal)
to suddenly produce something as a solution to a problem 突然提出解決方法；突施妙計
talk through your hat
- (old-fashioned, informal)
to say silly things while you are talking about a subject you do not understand 胡說；信口開河；瞎扯
throw your hat into the ring
to announce officially that you are going to compete in an election, a competition, etc. 正式宣布參加競選（或比賽等）