keep up with the Joneses
To follow the latest fashion; try to be equal with your neighbors.
Mrs. Smith kept buying every new thing that was advertised, finally Mr. Smith told her to stop trying to keep up with the Joneses and to start thinking for herself.
kick oneself
To be sorry or ashamed; regret.
When John missed the train, he kicked himself for not having left earlier.
Mary could have kicked herself for letting the secret out before it was announced officially.
kick up one's heels
To have a merry time; celebrate.
Весело проводить время; праздновать.
When exams were over the students went to town to kick up their heels.
Mary was usually very quiet but at the farewell party she kicked up her heels and had a wonderful time.
After the exams, we kicked up our heels and had a really good party.
После экзаменов мы пошли развлекаться и устроили отличную вечеринку.
kill two birds with one stone
To succeed in doing two things by only one action; get two results from one effort.
Mother stopped at the supermarket to buy bread and then went to get Jane at dancing class; she killed two birds with one stone.
The history teacher told us that making an outline kills two birds with one stone; it makes us study the lesson till we understand it, and it gives us notes to review before the test.
kiss someone goodbye
kiss something goodbye
To lose or give up someone or something forever.
"If you won't marry Jane," Peter said to Tom, "you might as well kiss her goodbye."
People who bet on a losing horse at the races might as well kiss their money goodbye.
knock off one's feet
To surprise (someone) so much that he does not know what to do.
Her husband's death knocked Mrs. Jones off her feet.
When Charlie was given the prize, it knocked him off his feet for a few minutes.
knock one's block off
To hit someone very hard; beat someone up.
Stay out of my yard or I'll knock your block off.
Jim will knock your block off if he catches you riding his bike.
knock oneself out
To work very hard; make a great effort.
Mrs. Ross knocked herself out planning her daughter's wedding.
Tom knocked himself out to give his guests a good time.
She really knocked herself out trying to pass that difficult class.
Don’t knock yourself out during practice. Save your strength for the competition later.