Monday

Monday morning feeling:

the feeling after the weekend when no-one wants to go to work or school

„I’ve got that Monday morning feeling”

Black Monday: Monday, October 28, 1929, when the price of shares on the New York Stock Exchange lost a lot of their value, causing very serious economic problems in  the US and Europe, and leading to the Great Depressions of the 1930s

„Black Monday kicked-off the Depression”

Blue Monday: the third Monday in January, said to be the most depressing day of the year

“Blue Monday is definitely the most gloomy day of the year.”

Cyber Monday: the Monday after the Thanksgiving holiday in the US, when online stores reduce the price of goods in order to attract customers

“I’ve bought my new TV on Cyber Monday. You wouldn’t believe how cheap it was!”

Black Friday: the Friday after Thanksgiving, when shops reduce the price of goods in order to attract customers who want to start their Christmas shopping

„The store was full of Black Friday shoppers chasing deals.”

Fat Cat Friday:  the third working day (and first Friday) of 2019, by which time the highest-earning UK employees have each already earned more than the average UK employee will earn in the whole of the year

„By Friday at 1pm, dubbed “Fat Cat Friday”, chief executives of leading UK companies will have been paid as much as a British worker across 12 months.”

Girl Friday: a female office worker who does different types of work

"They hired additional help, a girl Friday, to finish the work.”

Man Friday:  a man who helps someone with their work and is loyal and can be trusted

“The first known man Friday was Friday the servant in Robinco Crusoe”

Super Saturday: the last Saturday before Christmas Day, the day on which shops expect to make the most money in the whole year

“Supermarkets have prepared for Super Saturday to be their biggest day of the year.”

In one’s Sunday best: your best clothes, which you wear on special occasions

“This is going to be a formal event, so please come dressed in your Sunday best.”

source: https://dictionary.cambridge.org/dictionary