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Learner's definition of DAY  
[count]  : a period of 24 hours beginning at midnight : one of the seven time periods that make up a week
◊ If you do not look a day over a particular age, you appear to be that age.
If you say that someone is a particular age if he/she is a day, you mean that the person is that age or older.
: the time of light between one night and the next : the part of the day when light from the sun can be seen
— opposite night
: the part of the day when people are usually most active and when most businesses are open
◊ People sometimes say that they can't wait all day or don't have all day when they are in a hurry and need someone to move or act more quickly. These phrases are usually used in a rude way.
[count]  : the hours during a day when a person works or goes to school or when a company does business
◊ If something is all in a day's work for someone, it is part of a person's typical work.
To take a/the day off is to decide not to work on a particular day.
[count]  : the day on which something specified happens or is expected to happen
◊ If a day is your day, something good will happen to you on that day.
People sometimes use the phrase that'll be the day to say that they think something will not happen.
[count]  : a particular period of time
◊ The saying those were the days is sometimes used to say that a period of time in the past was pleasant and often better than the present time.
— often plural

(all) the livelong day

— see livelong

any day now

: within the next few days : soon

at the end of the day

— see 1end

call it a day

— see 1call

carry/win the day

: to win or be successful

day after day

: for several days without stopping or changing

day and night

ornight and day
: all the time : without stopping
: complete or total

day by day

: in small amounts every day
◊ If you take it/things day by day, you make progress in a slow and careful way by dealing with each day as it comes.

day in, day out

orday in and day out
: every day for many days : for a long time without stopping or changing

days are numbered

— see 2number

early days (yet)

— see 2early

every dog has its day

— see 1dog

for a rainy day

— see rainy

from day to day

: every day
— see also day-to-day

from one day to the next

: every day : as one day becomes another day

give (someone) the time of day

chiefly US, informal
: to pay attention to someone — usually used in negative statements

glory days

— see 1glory

have seen/known better days

— see 1better

in all your born days

— see born

in the cold light of day

— see 1cold

in this day and age

: at the present time in history

it is not every day

— used to say that something happens very rarely

late in the day

— see 1late

make someone's day

: to cause someone's day to be pleasant or happy

of the day

: served in a restaurant as a special item on a particular day
: of a particular period of time

one day

: at some time in the future
: on a day in the past

on the day

: on the day that an event happens

save the day

— see 1save

see the light of day

— see 1light

some day

: at some time in the future : someday

take each day as it comes

ortake one day at a timeortake it/things one day at a time
: to deal with each day's problems as they come instead of worrying about the future

the other day

— see 1other

these days

: at the present time
◊ The phrase one of these days means at some time in the future.

those days

: a period of time in the past
◊ If it is (just) one of those days, it is a day in which many bad or unpleasant things happen.

to the day

: to exactly a specified number of years

to this day

: up to now : continuing until today
Comments & Questions  
Comments & Questions
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