Meaning of day in English

all in a day's work
the best/happiest days of your life
day in day out
someone's/something's days are numbered
have had its/your day
have your day in court
in all my (born) days
in my day
in this day and age
make someone's day

More idioms

not be someone's day
oh my days!
the old days
one of these days
one of those days
one/some day
take it one day at a time/take each day as it comes
that'll be the day
those were the days
to the day

(Definition of day from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

day | American Dictionary

day

noun [ C ]

/deɪ/

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a period of 24 hours, esp. from 12 o’clock one night to 12 o’clock the next night, or the part of this period after the sun rises but before it goes down, when there is light:

My husband picks up our son every day after school.

In summer the days are longer and we have cookouts in the backyard.

We leave on vacation the day after tomorrow.

A day is also the part of a period of 24 hours that you spend at work:

He’s been working 12-hour days this week.

Days can mean a long period of time:

In those days (= that period in history), people had large families.

Idioms

day after day
day and night
day by day
day in, day out

(Definition of day from the Cambridge Academic Content Dictionary © Cambridge University Press)

Examples of day

day

Eggs are shed on the day of use.

From the Cambridge English Corpus

One male was used on each experimental day.

From the Cambridge English Corpus

An alternating pattern may result, for example, from a cyclic component with a period of about 2 days; persisting patterns may arise in several ways.

From the Cambridge English Corpus

Broadcasting of the fertilizer in flooded rice fields is easy and can be done in less than a day for an entire hectare.

From the Cambridge English Corpus

The target dose for purely ocular myasthenia is up to 0.75 mg/kg bodyweight on alternate days.

From the Cambridge English Corpus

If hemodynamic stability can be achieved, sinus rhythm returns in the vast majority of patients spontaneously within a few days after surgery.

From the Cambridge English Corpus

He fell again a few days later and returned with a second confirmed spinal fracture requiring cervical fusion.

From the Cambridge English Corpus

We replaced one of the scheduled formal discussions with two parallel informal discussions in the day room to explore the impact of context.

From the Cambridge English Corpus

The olives (four per container) were replaced every other day.

From the Cambridge English Corpus

A single leaf was placed in each pot containing larvae and this was replaced every second day.

From the Cambridge English Corpus

Trimedlure emitters from the barrier and the monitoring traps were replaced every two months and tri-pack attractants and dichlorvos strips were replaced every 45 days.

From the Cambridge English Corpus

The pieces of maize stems were replaced once every two days.

From the Cambridge English Corpus

In both years, the sticky flypaper was replaced every two days.

From the Cambridge English Corpus

The food/water mixture was replaced every other day.

From the Cambridge English Corpus

On average, there are 10 requests per day.

From the Cambridge English Corpus

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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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