If you rack your brain, you think very hard when trying to remember something or think hard to solve a problem, findf and answer, etc. ('Rack your brains' is an alternative.)
Rather you than me is an expression used when someone has something unpleasant or arduous to do. It is meant in a good natured way of expressing both sympathy and having a bit of a laugh at their expense.
If you read between the lines, you find the real message in what you're reading or hearing, a meaning that is not available from a literal interpretation of the words.
A real trouper is someone who will fight for what they believe in and doesn't give up easily. (People often use 'Real trooper' as the two words sound the same.)
(UK) If people are rearranging the deckchairs on the Titanic, they are making small changes that will have no effect as the project, company, etc, is in very serious trouble.
If you give someone the red-carpet treatment, you give them a special welcome to show that you think they are important. You can roll out the red carpet, too.
If someone reinvents the wheel, they waste their time doing something that has already been done by other people, when they could be doing something more worthwhile.
If you ride with the tide, you accept the majority decision.
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