1
- moving or capable of moving at high speed（能）快速移动（或行进）的, 快的：
a fast and powerful car.
一辆能高速行驶的大功率汽车。
1.1
- performed or taking place at high speed; taking only a short time快速进行的; 只花很短时间的：
the journey was fast and enjoyable.
这次旅行进行得既快又很愉快。
1.2
- attrib. allowing people or things to move at high speed可供人（或汽车等）高速移动（或行进）的：
a wide, fast road.
宽阔的快速路。
1.3
- performing or able to perform a particular type of action quickly（做某事）快速的, 迅速的：
a fast reader.
看书速度快的人。
1.4
- (of a sports field or ground) likely to make the ball bounce or run quickly or to allow competitors to reach a high speed（运动场地）有可能使球快速反弹（或行进）的; 允许参赛者发挥高速度的。
1.5
- (of a person or their lifestyle) engaging in or involving exciting and daring or shocking activities（人, 生活方式）放荡的, 胆大妄为的; 刺激的; 耸人听闻的：
the fast life she led in London.
她在伦敦过的放荡生活。
2
- predic. or as complement(of a clock or watch) showing a time ahead of the correct time（钟表）偏快的：
I keep my watch fifteen minutes fast.
我总是把表开快15分钟。
3
- firmly fixed or attached紧固的, 牢的, 紧的：
he made a rope fast to each corner.
他把绳子牢牢地固定在每个角上。
3.1
- (of friends) close and loyal（朋友）忠实可靠的。
3.2
- (of a dye) not fading in light or when washed（染料）不褪色的。
4
- Photography (of a film) needing only a short exposure【摄】（胶片）快速的（指所需曝光时间短）。
4.1
- (of a lens) having a large aperture and therefore suitable for use with short exposure times（镜头）快的, 强光的。
5
- （亦作 farse）W. Indian (of a person) prone to act in an unacceptably familiar way, typically by being inquisitive or gossipy〈西印度〉（人）过于热乎的（尤指爱打听或爱谈论他人私事）：
Mammy said, 'Stop asking questions, you too damn farse.'
妈妈说：“别再问个不停了, 你太爱打听别人私事了。”
1
- at high speed快：
he was driving too fast.
他车开得太快。
1.1
- within a short time在短时间内, 赶快：
we're going to have to get to the bottom of this fast.
我们得赶快把这件事弄个水落石出。
2
- so as to be hard to move; firmly or securely牢固地; 紧紧地：
the ship was held fast by the anchor chain.
船被锚链牢牢地固定着。
2.1
- (of sleeping) so as to be hard to wake（睡眠）熟的, 沉的：
they were too fast asleep to reply.
他们睡得太熟, 没有答话。
短语
pull a fast one
- informal try to gain an unfair advantage〈非正式〉试图占便宜：
he had been trying to pull a fast one on his co-producer.
他一直在设法占他的合伙制片人的便宜。
词源
Old English fæst 'firmly fixed, steadfast' and fæste 'firmly, securely', of Germanic origin; related to Dutch vast and German fest 'firm, solid' and fast 'almost'. In Middle English the adverb developed the senses 'strongly, vigorously' （compare with run hard）, and 'close, immediate' （just surviving in the archaic and poetic fast by ; compare with hard by）, hence 'closely, immediately' and 'quickly'; the idea of rapid movement was then reflected in adjectival use.
no obj.
1- abstain from all or some kinds of food or drink, especially as a religious observance绝食; 禁食（尤指斋戒）。
1.1
be fasted
technical be deprived of all or some kinds of food, especially for medical or experimental reasons〈技〉（为治疗、试验而）禁食; 忌食：all patients were fasted before surgery.
所有的病人在做外科手术前都不能吃东西。
- an act or period of fasting斋戒绝食; 斋戒期; 禁食期：
a five-day fast.
为期五天的斋戒期。
词源
Old English fæstan (verb), of Germanic origin; related to Dutch vasten and German fasten, also to Old Norse fasta, the source of the noun.