be all hat and no cattle

(US informal)tend to talk boastfully without acting on one's words

(美，非正式)空談，夸夸其談

black hat (或 white hat)

used in reference to the bad (or good) party in a situation (from the colour of hat traditionally worn by the bad (or good) character in Western films)

［用于指西部片場景中可通過帽子顏色判斷出來的壞人或好人］黑帽（或白帽）

we are the good guys—the black hats lost.

我們是那些好人——黑帽子壞人輸了。

hats off to ——

used to express admiration for someone who has achieved something or done something praiseworthy

向…致敬

hats off to them for agreeing to work for the day to raise money.

向同意在籌款日參加工作的人們致敬。

keep something under one's hat

keep something a secret

將…保密

pass the hat round (或北美pass the hat)

collect contributions of money from a number of people for a specific purpose

籌集錢款

pick something out of a hat

select something, especially the winner of a contest, at random

隨機挑出（尤指比賽中的獲勝者）

take one's hat off to

used to state one's admiration for (someone who has achieved something)

向 （取得成就之人）…致敬（或表示欽佩）

throw one's hat in or into the ring

express willingness to take up a challenge

欣然迎戰(zhàn)，接受挑戰(zhàn)

at the drop of a hat

At the slightest pretext or provocation.

以很小的事為借口或因很小的事而激怒

hat in hand

In a humble manner; humbly.

卑躬屈膝地；謙恭的

pass the hat

To take up a collection of money.

募捐：進行錢的募集

take (one's) hat off to

To respect, admire, or congratulate.

向某人表示贊賞、欽佩或祝賀

talk through (one's) hat

To talk nonsense.

胡說八道

To bluff.

虛張聲勢

throw (one's) hat into the ring 或 toss (one's) hat into the ring

To enter a political race as a candidate for office.

參加競選：作為職位的候選人參加政治競賽