let down

To cause to come down gradually; lower

放下，降下：使其逐漸下來；降低

let down the sails.

放下船帆

To withdraw support from; forsake.

使失望：沒有達到所期望的；使沮喪

let on

To allow to be known; admit

宣揚；承認

Don't let on that you know me.

不要讓人知道你認識我

To pretend.

假裝

let out

To come to a close; end

終止；結束

School let out early. The play let out at 11&b{p.m.}

學校放學早。話劇&b{晚上} 11點結束

To make known; reveal

使知道；泄露

Who let that story out?

是誰泄露了消息?

To increase the size of (a garment, for example)

放大（衣服）：增大（例如衣服的）尺寸

let out a coat.

放大一件外衣

let up

To slow down; diminish

放慢；減緩

didn't let up in their efforts.

他們沒有松勁

To come to a stop; cease

停止；暫停

The rain let up.

雨停下來了

let someone/thing alone

The rain let up.

雨停下來了

let someone/thing be

stop disturbing or interfering with

別打擾，不干預

let him be—he knows what he wants.

隨他去吧——他知道自己要做什么。

let someone down gently

seek to give someone bad news in a way that avoids causing them too much distress or humiliation

委婉告訴，給…臺階下

let something drop (或 fall)

casually reveal a piece of information

無意中說出，不經意透露

from the things he let drop I think there was a woman in his life.

從他隨口說出的話里，我聽出他身邊有一個女人。

let fall

(Geometry)draw (a perpendicular) from an outside point to a line

(幾何)向一直線作垂線

let fly

attack, either physically or verbally

對…進行（身體或語言）攻擊

the troops let fly with shells loaded with chemical weapons.

軍隊用化學武器炮彈進行攻擊。

let oneself go

act in an unrestrained or uninhibited way

率性而為

you need to unwind and let yourself go.

你該放松下來，干點自己想干的事。

become careless or untidy in one's habits or appearance

不修邊幅，邋遢

he's really let himself go since my mother died.

自從媽媽去世之后，他變得越來越邋遢。

let someone/thing go

allow someone or something to escape or go free

放，釋放

they let the hostages go.

他們放了人質。

(亦作 let go 或 let go of)relinquish one's grip on someone or something

放開，釋放

Adam let go of the reins.

亞當脫手韁繩。

you must let the past go.

你必須擺脫過去。

let someone have it

(informal)attack someone physically or verbally

(非正式)揍，教訓；痛罵

I really let him have it for worrying me so much.

他老是煩我，我好好教訓了他一頓。

let in (或 out) the clutch

engage (or release) the clutch of a vehicle by releasing pressure on (or applying it to) the clutch pedal

咬合（或放開）離合器