Day-to-day
Daily, everyday.The president was not involved in the day-to-day running of the university.
Day in and day out
Regularly, all of the time.My father goes to a small restaurant for lunch day in and day out and he never gets tired of it.
Day and night
All of the time.We worked day and night to finish the project before the end of the month.
Day after day
Everyday.Day after day, the woman goes to the school to meet her child.
Dawn on (someone)
To become clear or occur to someone.It finally dawned on me why my friend was angry.
Davy Jone’s locker
The bottom of the sea (as a grave).When the boat sank, all of the crew members went to Davy Jone's locker.
Date (someone)
To go on a date with someone, to have a date with someone.My sister has been dating her boyfriend for two years.
Date back to (a previous time)
To go back to a previous time.The old building dates back to 1850.
Dash off (something) / dash (something) off
To write or finish something quickly.I plan to dash off a letter before I go to work.
Dash off
To leave quickly.We dashed off as soon as the concert ended.