let down

To cause to come down gradually; lower

放下，降下：使其逐渐下来；降低

let down the sails.

放下船帆

To withdraw support from; forsake.

使失望：没有达到所期望的；使沮丧

let on

To allow to be known; admit

宣扬；承认

Don't let on that you know me.

不要让人知道你认识我

To pretend.

假装

let out

To come to a close; end

终止；结束

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

学校放学早。话剧&b{晚上} 11点结束

To make known; reveal

使知道；泄露

Who let that story out?

是谁泄露了消息?

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；减缓

didn't let up in their efforts.

他们没有松劲

To come to a stop; cease

停止；暂停

The rain let up.

雨停下来了

let someone/thing alone

The rain let up.

雨停下来了

let someone/thing be

stop disturbing or interfering with

别打扰，不干预

let him be—he knows what he wants.

随他去吧——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

委婉告诉，给…台阶下

let something drop (或 fall)

casually reveal a piece of information

无意中说出，不经意透露

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

从他随口说出的话里，我听出他身边有一个女人。

let fall

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

(几何)向一直线作垂线

let fly

attack, either physically or verbally

对…进行（身体或语言）攻击

the troops let fly with shells loaded with chemical weapons.

军队用化学武器炮弹进行攻击。

let oneself go

act in an unrestrained or uninhibited way

率性而为

you need to unwind and let yourself go.

你该放松下来，干点自己想干的事。

become careless or untidy in one's habits or appearance

不修边幅，邋遢

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

自从妈妈去世之后，他变得越来越邋遢。

let someone/thing go

allow someone or something to escape or go free

放，释放

they let the hostages go.

他们放了人质。

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

放开，释放

Adam let go of the reins.

亚当脱手缰绳。

you must let the past go.

你必须摆脱过去。

let someone have it

(informal)attack someone physically or verbally

(非正式)揍，教训；痛骂

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

他老是烦我，我好好教训了他一顿。

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（或放开）离合器