light

1 light /ˈlaɪt/ noun
plural lights
1 light
/ˈlaɪt/
noun
plural lights
Britannica Dictionary definition of LIGHT
1 
[noncount] : the form of energy that makes it possible to see things : the brightness produced by the sun, by fire, by a lamp, etc.
— sometimes used figuratively
2 
[count]
a  : a source of light (such as an electric lamp)
— see also nightlight
b  : a light on a vehicle
3 
[singular] : a way of showing or understanding something or someone
4 
[count] : a light or set of lights used to control traffic : traffic light
5 
[singular] informal : a flame for lighting a cigarette
6 
[noncount] formal : daylight 1
— see also see the light of day (below)
7 
[singular] : a quality in a person's eyes that shows emotion
8 
lights [plural]
a  : light colors : colors that are more white than black
b  : light-colored clothes

according to your lights

formal
: according to your idea of what is right

a light at the end of the tunnel

: a reason to believe that a bad situation will end soon or that a long and difficult job will be finished soon

bring (something) to light

: to tell people about (something) : to make (something) known

cast/shed/throw light on

: to help to explain (something) : to make it possible to understand or know more about (something)

come to light

: to become known

hide your light under a bushel

— see bushel

in someone's light

: blocking the light that someone needs to see or read something

in the cold light of day

— see 1cold

in the light of

or US in light of
1 
: while thinking about (something that affects the way you see or understand things)
2 
: because of (something)

light dawns

◊ When people suddenly understand something that they had not understood before, (a/the) light dawns (on them).

more heat than light

— see 1heat

out like a light

informal
1 
: asleep
2 

punch someone's lights out

— see 1punch

see the light

informal
: to suddenly understand or realize the truth of something

see the light of day

1 
: to be seen or used
2 
: to become publicly known

set light to

chiefly British
: to cause (something) to begin burning

the light of your life

: a person you love very much and who makes you happy

trip the light fantastic

— see 2trip
2 light /ˈlaɪt/ adjective
lighter; lightest
2 light
/ˈlaɪt/
adjective
lighter; lightest
Britannica Dictionary definition of LIGHT
1 
: not dark or deep in color : pale
2 
b  : having the light of the day
3 light /ˈlaɪt/ verb
lights; lighted or lit /ˈlɪt/ ; lighting
3 light
/ˈlaɪt/
verb
lights; lighted or lit /ˈlɪt/ ; lighting
Britannica Dictionary definition of LIGHT
1 
[+ object] : to provide light for (something)
2 
a  [+ object] : to cause (something) to burn
— see also light up 3 (below)
b  [no object] : to begin to burn

light a fire under (someone)

US, informal
: to cause (someone) to move or work more quickly and effectively

light into

[phrasal verb]
light into (someone) US, informal
: to attack or criticize (someone) forcefully

light on/upon

[phrasal verb]
light on/upon (something)
: to find or see (something) by chance

light out

[phrasal verb] US, informal
: to leave in a hurry for someplace

light up

[phrasal verb]
1 
a  of a light : to become lit : to begin shining — often used figuratively
b  informal, of a telephone : to show a light indicating that someone is calling
2 
light (something) up or light up (something) : to provide light for (something) : to fill (something) with light
— often used figuratively
3 
informal : to light a cigarette
4 light /ˈlaɪt/ adjective
lighter; lightest
4 light
/ˈlaɪt/
adjective
lighter; lightest
Britannica Dictionary definition of LIGHT
1 
a  : not heavy : having little weight or less than usual weight
b  : small in size and weight
2 
a  : less in amount or degree than usual
c  : not great or large
d  : not difficult to accept or bear : not harsh or severe
e  : slight or minor in degree or effect
— opposite heavy
3 
: not involving a lot of physical effort
— opposite heavy
4 
: not loud or forceful
— opposite heavy
5 
: not important or serious : intended mainly for entertainment — opposite heavy
6 
: not dense and thick
— opposite heavy
7 
: made with thin cloth and not very warm — opposite heavy
8 
a  : eating, drinking, or using a small amount of something
b  : producing a small amount of something
c  : not done often or in large amounts — opposite heavy
9 
a  : not having a large amount of food : not making your stomach feel full
b  : made with fewer calories or with less of some ingredient than usual
c  : not rich, dense, or thick — opposite heavy
10 
a  : designed to carry a small load or few passengers
b  : not as large and powerful as other weapons, machines, etc.
c  of a group of soldiers : having fewer and smaller weapons and less armor than other groups but able to move quickly

light on

: having or using a small amount of (something)

light on your feet

: capable of moving in a quick and graceful way

light sleeper

: someone who wakes up easily

make light of

: to treat (something, such as a problem) in a joking way : to not be serious about (something important)

— lightness

/ˈlaɪtnəs/ noun [noncount]
5 light /ˈlaɪt/ adverb
lighter; lightest
5 light
/ˈlaɪt/
adverb
lighter; lightest
Britannica Dictionary definition of LIGHT

eat light

US
: to eat foods that will not cause you to gain weight

travel light

: to travel with little baggage