mark down
To lower the price.
The department store marked down their prices on women's sandals.
To give a poor grade to a student.
Peter was marked down for his numerous spelling errors.
To make a written note of something.
Here is my phone number; mark it down.
markdown
A reduction in price.
Joan asked, "Do you like my new sandals? They were markdowns at Marshall Field's."
nail down
To make certain; make sure; settle.
Joe had a hard time selling his car, but he finally nailed the sale down when he got his friend Sam to give him $300.
The New York Yankees nailed down the American League Championship when they beat the Red Sox 3 to 0 on September 15.
narrow down
To limit within very strict margins.
Of the numerous applicants, the list has been narrowed down to just a few.
nervous breakdown
A mild or severe attack of mental illness; a collapse of a person's ability to make decisions and solve problems because of overwork, great mental strain, or the like.
When the mother saw her baby run over, she suffered a nervous breakdown.
nose down
To head down; bring down the nose of.
The big airliner began to nose down for a landing.
The pilot nosed the plane down toward the runway.
off one's high horse
come down off one's high horse
get down off your high horse
Not acting proud and scornful; humble and agreeable.
The girls were so kind to Nancy after her mother died that she came down off her high horse and made friends with them.
Acting friendly again; not angry and unpleasant any more; agreeable.
Sally wouldn't speak to anyone all afternoon because she couldn't go to the movies, but she's off her high horse now.
To become less arrogant; to assume a more modest disposition.
The boastful candidate for Congress quickly came down off his high horse when he was soundly beaten by his opponent.
pare down
To limit; economize; reduce.
With a smaller income per month, the family had to pare down their household expenses.