1 If you have your finger on the pulse, you are in touch with what is happening.
2 A cliche is something that has been said so often that it has lost its meaning, so the person is trying to say that while such claims have been made before many times, they are true here.
3 We spend too much in the sales and are too lazy to bother about our health.
4 People who don't know about them will find them a bit frightening because there are so many.
5 If something is a no-no, you mustn't do it.
6 Take a back seat- Be less important