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to fast

to fast

34 4.6
To not eat or drink for a time
  • verb
  • /fæst/
: ayunar
  • To prepare for his medical exam, he had to fast for twelve hours beforehand.
  • fasting blood glucose
  • fasting blood test
  • fasting blood glucose level

If it's in your practice to fast fast, that's fine.

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Examples

  • But in the old days, one would fast all of Lent.

  • Well, thank you for the thought, Sister, but I am fasting.

  • When did you start fasting and why?

  • I think we all felt guilty, as if we should be fasting to show respect.

    Fiction book (1992)
  • While the rest of us ate, the Cat fasted in preparation for the Hunt.

    Fiction book (1991)
  • So you'll notice I don't fast very often because it's painful.

  • I just don't understand why you insist on fasting.

  • Having started to meditate daily, she then began fasting and refused to bathe or change her clothes.

    Academic text (1997)
  • She decided to fast for three days to cleanse her body and spirit.

  • Many people fast during Ramadan to grow closer to their faith.

Antonyms

94 4.3

To allow yourself to enjoy something pleasant, often more than needed

37 2.3

To eat and drink a lot, usually at a special meal

Idioms

not so fast
  • Informal
82 5.8

Tell someone to slow down when they act too quickly

20 2.5

Resting very deeply and not easy to wake

in the fast lane
  • Informal
15 6.4

Living a life full of excitement and danger

12 8.3

To trick someone in a clever way so they do not notice

9 8.0

Act in a careless way by ignoring rules and other people's feelings

8 5.2

A way of spending time that is exciting, fast, and often risky

Phrasal Verbs

Skip quickly to a later part of a recording or presentation

17 5.5

To stay firmly attached to something or keep believing strongly in an idea

Refuse to change your mind when others disagree

6 8.1

To trick someone to gain an advantage

5 5.5

Fail to make progress even when you try hard

Compounds

154 1.0

Cheap food that is already cooked and sold to eat quickly, like hamburgers or fried chicken

75 3.5

Something that gets much bigger or more common very quickly

61 3.9

A quick route to success or promotion

34 2.5

A speed that is quicker than usual for a task or activity

26 3.9

Happening very quickly with a lot of action

fast lane
  • Informal
17 5.8

A very busy, exciting life that often brings risk and pressure

fast one
  • Informal
17 8.2

A clever trick used to cheat someone

11 5.7

Very clear rules or limits that do not allow change

fast break
  • Jargon
10 3.5

A quick attack where a team moves fast down the court to score before the defense sets up

A fixed instruction you cannot change or adapt

lightning fast
  • Informal
6 3.6

Happening or moving very quickly

5 2.8

A road lane for vehicles that move faster than other lanes

4 1.9

A quick help that has very little waiting time

A place where things change and happen very quickly

fast buck
  • Slang
3 7.9

Money earned quickly, often by dishonest or easy ways

fast reactor
  • Specialized
3 8.4

A nuclear reactor that uses fast neutrons without a moderator to make energy

1 5.9

A day when people do not eat for religious or spiritual reasons

1 3.7

Moving quickly through the air like a bird or a jet

A way of living with constant activity and little time to rest

fast time scale
  • Specialized
1 7.7

A way of running a simulation where time moves faster than real life

1 7.4

A person who becomes successful or well known very quickly

A Jewish fast kept by firstborn sons the day before Passover to remember how they were saved in Egypt

A one-day event when many Jews do not eat or drink before Purim to remember Esther

1 9.9

A major Jewish fast on the ninth day of Av that remembers the destruction of the temples in Jerusalem

A Jewish day when people do not eat or drink from dawn to dusk to remember Jerusalem's walls being broken

A set of computer rules that lets local devices send secure messages and manage a network

fast mate
  • Informal
6.6

A close friend who spends a lot of time with you

A major Jewish day when people do not eat to remember when the temples were destroyed in Jerusalem

A day in the Jewish calendar when Jews do not eat or drink to remember Gedaliah's killing

A minor Jewish fast on the tenth of Tevet to remember the siege of Jerusalem and Holocaust victims

A very important Jewish day when people fast, like Yom Kippur or Tisha B'Av

A day in Judaism when adults fast from dawn to nightfall but can do normal work

How Much

to starve
192 1.7
to undereat
1 5.6
to fast
34 4.6

Surface Forms

fast infinitive
fasted past
fasted past participle
fasting present participle
fasts third person singular

Etymology

Fast as a verb comes from an old idea of 'holding back' or keeping firm control, so to fast is to 'hold back' from food for religious or medical reasons. That is why doctors or religions may ask you to fast before a test or a ritual.