at the drop of a hat

(informal)without delay or good reason

(非正式)立即；莫名其妙地，一有刺激就

he used to be very bashful, blushing at the drop of a hat.

他曾經非常害羞，會莫名其妙地臉紅。

drop one's aitches

omit the ‘h’ sound from the beginning of words (in Britain often regarded as a sign that the speaker belongs to a low social class)

省略單詞開頭的‘h’音（在英國常被認為是說話者社會階層低下的標志）

drop asleep

fall gently asleep, especially without intending to

不知不覺睡著

drop the ball

(N. Amer. informal)make a mistake; mishandle things

(北美，非正式)犯錯，出錯，做錯事

I really dropped the ball on this one.

在這件事上我的確出了錯。

drop a brick

(Brit. informal)make an indiscreet or embarrassing remark

(英，非正式)失言；出言不慎

he dropped a brick when he admitted that he knew where we were going.

他不小心說漏了嘴，承認他知道我們要去哪兒。

drop a clanger

(Brit. informal)make an embarrassing or foolish mistake

(英，非正式)做事出岔子，犯愚蠢的錯誤

he admitted he might have dropped his first managerial clanger.

他承認自己可能在管理上出了第一個岔子。

drop a curtsy

(Brit.)make a curtsy

(英)行屈膝禮

drop dead

die suddenly and unexpectedly

突然倒斃，猝

she had seen her father drop dead of a heart attack.

她曾看見她父親因心臟病發作而猝 。

drop a (或 the) dime on

(US informal)inform on (someone) to the police

(美，非正式)向警方告發（某人）

drop one's guard

abandon one's habitual defensive or protective stance

喪失警惕，放棄戒備

drop a hint (或 drop hints)

let fall a hint or hints, as if casually or unconsciously

（裝作漫不經心地）暗示

he was dropping hints that in future he would be taking a back seat in politics.

他暗示將來要在政壇退居二線。

a drop in the ocean (或 in a bucket)

a very small amount compared with what is needed or expected

滄海一粟

the ￡550 million saving is likely to be a drop in the ocean.

節約的5.5億英鎊有可能是滄海一粟。

drop someone a line

send someone a note or letter in a casual manner

給…寫短信（或便條）

drop me a line at the usual address.

按老地址給我寄封短信。

drop names

drop me a line at the usual address.

按老地址給我寄封短信。