fast

1 fast /ˈfæst/ Brit /ˈfɑːst/ adjective
faster; fastest
1 fast
/ˈfæst/ Brit /ˈfɑːst/
adjective
faster; fastest
Britannica Dictionary definition of FAST
1 
[more fast; most fast]
a  : moving or able to move quickly
b  : happening quickly : taking a short amount of time
d  : doing something or able to do something quickly
e  : allowing movement at a great speed — see also fast lane, fast track
2 
of a clock or watch : showing a time that is later than the correct time
3 
photography : allowing photographs to be taken very quickly or when there is very little light
4 
informal
a  : tricky and unfair
b  : earned or gotten quickly and often in a dishonest way
c  : quick and not safe to trust
— see also fast-talk
5 
old-fashioned + humorous
a  : actively seeking excitement or pleasure : wild
b  of women : very willing to have sex
6 
a  : placed, tied, or attached in a way that is not easily moved
b  : closed tightly
c  : impossible to change — used in the phrase hard and fast
7 

fast and furious

: in a very fast and forceful way : with one thing following another very quickly
◊ The phrase fast and furious is used both as an adjective and as an adverb.

play fast and loose

— see 1play
2 fast /ˈfæst/ Brit /ˈfɑːst/ adverb
faster; fastest
2 fast
/ˈfæst/ Brit /ˈfɑːst/
adverb
faster; fastest
Britannica Dictionary definition of FAST
1 
: with great speed
: in a very short time : very quickly
— opposite slow, slowly
2 
a  : in a quick and intelligent way
b  : quickly and in a way that is meant to deceive or persuade someone
— see also fast-talk
3 
: in a way that is not easily moved or changed

fast and furious

— see 1fast

fast asleep

— see asleep

going/getting nowhere fast

informal
◊ To be going/getting nowhere fast is to be failing to make progress or to produce a desired result.

not so fast

informal
— used in speech to say that you disagree with what someone has said or to tell someone to stop or slow down
3 fast /ˈfæst/ Brit /ˈfɑːst/ verb
fasts; fasted; fasting
3 fast
/ˈfæst/ Brit /ˈfɑːst/
verb
fasts; fasted; fasting
Britannica Dictionary definition of FAST
[no object]
: to eat no food for a period of time

— fasting

noun [noncount]
4 fast /ˈfæst/ Brit /ˈfɑːst/ noun
plural fasts
4 fast
/ˈfæst/ Brit /ˈfɑːst/
noun
plural fasts
Britannica Dictionary definition of FAST
[count]
: a period of time when you do not eat any food : a time of fasting