1.sharp的基本意思是“锋利的,尖锐的”,也可作“急转的,陡峭的”“突然的,急剧的”“尖锐的,刺耳的”“强烈的,辛辣的,刺鼻的”“刺骨的,凛冽的,剧烈的”“蓄意中伤的,尖刻的,严厉的”解; 指人时,强调精明,不易受骗,指动作时强调机警、敏捷等,可作“灵敏的,机警的”“迅速的,敏捷的,活跃的”“过分精明的,狡猾的,不择手段的”“时髦的,漂亮的”解。
2.sharp在句中可用作定语或表语。

as sharp as a needle
非常聪敏的 very intelligent and quick-witted
Young though he was, the child was as sharp as a needle and sensed the disharmony between his parents.虽然这孩子还小,但很聪明,他觉察到他父母之间不和谐。

have a sharp tongue
非常生气地说,讽刺,挖苦 talk angrily or sarcastically
I usually get on well with my uncle, although he can have a sharp tongue occasionally.虽然有时叔叔待我态度很生硬,但我与他相处得还是很好的。
I dislike the man, he has such a sharp tongue.我不喜欢这个人,他爱说刻薄挖苦的话。

sharp practice
欺诈手段 dishonesty
This sale sounds like sharp practice to me and I want nothing to do with it.这笔买卖在我听来像是不实在,我不想沾边。
Just because we underbid our rivals and got a major order, they have accused us of sharp practices.只是因为我们投标时出价低于对手得到了一个大数量的订货单,他们便指责我们有欺诈行为。

sharp's the word
赶快 be quick〔hurry〕
Sharp's the word!We've only got ten minutes to get to the station to catch the train.快!我们必须在10分钟内到达车站赶上火车。

用作定语
▲～+n.
 He scraped at the wound with a sharp blade of stone.他用一块锋利的石头刮伤口。
We'll need a sharp knife to cut the beefsteak.我们需要一把快刀来切牛排。
The road is full of sharp turns.那条路有许多急转弯。
The General Motors Corporation had reported a sharp drop in profits on Tuesday.通用汽车公司曾在星期二报告说该公司的利润急剧下降。
There had been a sharp rise in the patient's temperature during the night.夜间病人的体温曾急剧上升。
There were sharp differences of opinion between the two.两人的意见存在着明显的分歧。
Black hair is a sharp contrast to fair skin.黑色的头发与白皙的皮肤形成鲜明对比。
The branch broke with a sharp crack.树枝折断时发出刺耳的噼啪声。
This salad dressing has a sharp taste.这种生菜的调味品味道辛辣。
Sharp stomachs make short graces.衣食足然后知礼仪。
The mountain climbers struggled against the sharp wind.登山队员们冒着刺骨的寒风前进。
He felt a sudden sharp pain in his heart.他突然感到心脏一阵剧痛。
She experienced a sharp pang of disappointment.她经历了失望的巨大痛苦。
Birds have sharp eyes and dogs have sharp noses.鸟有敏锐的视力,而狗有灵敏的嗅觉。
It takes sharp eyes to see the flaw.要有好的眼力才能看见这条裂缝。
The company keeps a sharp watch on the market.这家公司很注意市场的情况。
I have a very sharp recollection of my last talk with him two years ago.两年前我和他最后一次谈话的情景仍历历在目。
She got a sharp reproach from her boss.她受到了上司的严厉申斥。
In the face of sharp criticisms the young scientist still stuck to his colours.面对着尖锐的批评这位青年科学家依然坚持自己的主张。
The boxer gave his opponent a sharp blow on the head.那位拳击手给了对手头部迅速而有力的一击。
His sharp business dealings earned him a bad reputation.他靠欺诈经商,名声很坏。
He's a very sharp man.他是一个衣着非常时髦的人。
He was always the sharpest kid in the block when he was dressed up.他打扮起来总是街区里最帅的小伙子。
用作表语
▲S+be+～
 This knife is very sharp.这把小刀很锋利。
The point of a needle is sharp.针尖是锐利的。
I can't cut with a knife that isn't sharp.我不能用钝的刀子切削。
He is ninety years old, but his mind is sharp.他虽然90岁了,但头脑还很灵活。
That photograph isn't very sharp.那幅照片色彩不很鲜明。
We must be sharp if we are to catch the train.如果我们要搭这班火车,必须赶快走。
It was late autumn and the night wind was sharp.已经是深秋了,晚风刺骨。
Their hunger pangs were sharper than my pangs of conscience.他们饥饿的剧痛比我内疚的痛苦更强烈。
Sometimes the customer may be sharper than the dealer.有时候顾客可能比商人还要精明。
That note sounded sharp.那个音调听起来偏高。
▲S+be+～+prep.-phrase
 He was sharp about money.他对钱是很精明的。
The girl is sharp at music.这个女孩对音乐的感受力很灵敏。
She is too sharp for me.她比我精明多了。
He is sharp upon his son.他对待儿子很苛刻。
She was sharp with her son who was late for dinner.她儿子没有及时回家吃饭,她就对他大发脾气。

sharp, acute, keen
这组词都有“锋利的”“敏锐的”意思。其区别在于:sharp指人时,强调精明,不易受骗,指动作时强调机警、敏捷等; keen指刀尖或刀刃等“锋利的”“锐利的”,用于比喻,指风“刺骨的”,味道“刺鼻的”,批评等“尖刻的,尖锐的”; acute指人的五官,感觉,智力等是尖锐的,也可指疾病是急性的。例如:
She has a sharp nose.她嗅觉灵敏。
There was a keen wind blowing from the east.有阵刺骨的寒风从东边刮来。
Dogs have an acute sense of smell.狗有敏锐的嗅觉。
Pneumonia is an acute disease.肺炎是一种急性疾病。

1.sharp用作副词的意思是“准时地”,指时间的“正点”。
2.sharp也可作“突然地,急剧地”解,指方向的急转。
3.sharp还可作“偏高”解,指乐声偏高或升半音。

look sharp
赶快 be quick
Look sharp!Here comes the boss!快点!老板来了!
Get those boxes moved, and look sharp about it!把那些箱子搬走,快!
You'll have to look sharp if you want to be on time.如果你想准时,你就得赶快。

用作状语
Please be on hand at 12 sharp.请在12点整到这里来。
I went to bed at 11：30 sharp last night.我昨晚11点半准时上床睡觉。
Tell him I'll be there at eleven sharp.告诉他我十一点整在那儿。
Be at my home at six o'clock sharp, not a second before or after.6点钟准时到我家,不能早一秒,也不能迟一秒。
Turn sharp right at the next corner.在下一个拐弯处向右急转。
The road turns sharp to the left.公路向左急转弯。
The car stopped too sharp.汽车突然停住。
Food prices rose the sharpest.食品价格上涨得最厉害。
The violin sounds a little sharp—can you come down a little?小提琴音听起来偏高了些,你调低一点好吗?
She ruined her performance by singing sharp.她因唱得音调过高而破坏了她的演出。

sharp, sharply
这两个词用法有所不同:sharply是普通常用副词; 而sharp一般只用在look sharp, turn sharp left〔right〕这几个习语中。例如:
You go over the bridge and the road turns sharp left.你走过桥,路就突然地向左拐。
They had never heard their father speak sharply before.他们以前从来没有听到过父亲厉声地说话。

［派生词］ sharply adv. 突然地,急剧地
［同义词］ adj.  abrupt, fine, not blunt, rapid, sudden, clear, distinct, extreme; harsh, shrill, quick adv.  abruptly, exactly, promptly, suddenly, unexpectedly
［反义词］ adj.  blunt, dull, easy, gentle, moderate, slow
［词源］  ＜古语scearp(尖锐的,锋利的)