Make No Bones About: to say clearly what you think, especially unpleasant
Example: The Client made no bones about their dissatisfaction with our proposal.
Match Made in Heaven: a combination of two people that is perfect in every way
Example: We could win this game perfectly. James and Tom were really a match made in heaven.
Method to My Madness: have a good reason although that is strange or crazy actions
Example: There was method to my madness, I will explain them to you in detail later on.
Miss the boat: someone missed his or her chance
Example: There were tickets available last week, but he missed the boat by waiting till today to try to buy some.
Mumbo Jumbo: words or activities that seems nonsense or meaningless
Example: Mike always like a kid, most of what he says is mumbo jumbo.
Mum's the word: to keep silent or quiet, or to keep something a secret
Example: I don't want to spoil the surprise for children, please keep in mind that mum's the word.