A day is a 24-hour period that measures the passage of time. This word also refers to the time that occurs between sunrise and sunset.

  • What day is today? Today is Sunday.
  • It looks like it’s going to be a good day.
  • What do you do during the day?
  • I hope you have a good day.
  • How many days a week do you go to work or school?
  • There are 24 hours in a day.
  • There are seven days in a week.
  • There are 365 days in a year.
  • The day after today is tomorrow.
  • Night turns to day at sunrise.
  • Day turns to night at sunset.

There are many expressions that include the word "day."

  • Tomorrow will be another day. (We can continue this later.)
  • We should call it a day. (We should stop working.)
  • Let’s call it a day. (Let’s stop.)
  • There just aren’t enough hours in a day. (There isn’t enough time to accomplish one’s goals.)
  • Every dog has his day. (Everyone–including dogs–has a good day at some point in life.)
  • It’s plain as day. (It’s obvious.)
  • My car has seen better days. (It’s an old car, but it was once new and beautiful.)
  • We need to take things one day at a time. (Make progress but slowly.)
  • Rome wasn’t built in a day. (It takes time to make progress.)
  • That idea will never see the light of day. (It will never become a real thing.)
  • Those were the good old days. (I have fond memories of past events.)
  • We’ll be ready to go on day one. (day one = the first day in a period of time)
  • An apple a day keeps the doctor away. (If you eat healthy food regularly, such as an apple, you aren’t as likely to get sick.)

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Date of publication: February 5, 2017