To chip in. = To help out, usually with money.
As our teacher was retiring, we all chipped in to buy him a going away present.
To be bushed. = To be very tired or fatigued.
I've been working hard all week and now I feel really bushed.
To pour cold water on. = Discourage or to reduce emotions.
Lack of snow poured cold water on my ski vacation.
Out-of-touch. = Not to have contact with someone or something.
Since I live in Japan I have been out-of-touch with the American social scene.
On second thought. = To reconsider or to think again.
I wanted to have ice cream for desert but on second thought, ice cream is fattening, so I changed my mind.
Double-check. = To check two times.
Before I leave my house I check and then double-check to make sure that I have my train pass.
To mollify. = To make quiet and peaceful.
She was upset with him and his excuses failed to mollify her.
To fib. = To tell a false story about something unimportant.
The old man would sometimes tell fibs about his childhood to impress his grandchildren.
24/7 = All day and all night seven days a week.
Convenience stores, police stations and this building are open 24/7.
A hassle. = A problem, an irritation, a delay or a bothersome situation.
After 9/11, going through customs is a hassle.