burn the midnight oil
To study late at night.
Exam time was near, and more and more pupils were burning the midnight oil.
call it a day
call it a night
To declare that a given day's work has been accomplished and go home; to quit for the day/night. To stop working for the rest of the day/night.
"Let's call it a day," the boss said, "and go out for a drink."
It was nearly midnight, so Mrs. Byron decided to call it a day, and left the party, and went home.
The four golfers played nine holes and then called it a day.
Herb tried to repair his car engine all morning before he called it a day and went fishing.
We've been working hard on this project all evening; let's call it a night.
call it a night
To declare that an evening party or other activity conducted late in the day is finished.
I am so tired that I am going to call it a night and go to bed.
day and night
night and day
For days without stopping; continually.
Без перерыва; постоянно; все время.
Some filling stations on great highways are open day and night 365 days a year.
The three men took turns driving the truck, and they drove night and day for three days.
The woman was thinking about her missing child day and night.
Женщина всё время думала о своем пропавшем ребенке.
Every day and every evening.
The girl knitted day and night to finish the sweater before her mother's birthday.
fly-by-night
A company that sells many cheap things for a big profit and then disappears.
A dependable company honors its guarantees, but a fly-by-night only wants your money.
A person who does not pay his bills, but sneaks away (as at night.)
Hotels are bothered by fly-by-nights.
Set up to make a lot of money in a hurry, then disappear so people can't find you to complain about poor work, etc.; not trustworthy; not reliable.
Mrs. Blank bought her vacuum cleaner from a new company; when she tried to have it fixed, she found it was a fly-by-night business.
good night
Used as a polite phrase when you leave someone at night.
"Good night!" said Bob as he left Dick's house after the party. "I'll see you in the morning."
Bill said good night to his parents and went upstairs to bed.
Used to show surprise and often some fear or anger.
Mr. Johnson's eyes opened wide when he saw the fish his little boy had caught, and said, "Good night!"
like a thief in the night
Действовать секретно, тихо или в неожиданной манере.
He left the company like a thief in the night, without telling his colleagues or saying goodbye.
Он ушел из компании очень неожиданно, даже ничего не сказал коллегам и не попрощался с ними.
make a night of it
To spend the whole night at an activity.
The dog found the door unlatched and made a night of it.
The boys and girls at the dance made a night of it.