Riddle wrapped up in an enigma British noun phrase
Something very mysterious, indecipherable or impossible to foretell
Philosophy is a riddle wrapped up in an enigma, I cannot understand what teacher's teaching.
Can you please explain more about your plan? It's like a riddle wrapped up in an enigma.
'A riddle wrapped up in an enigma' is a noun phrase, therefore, it's often used after a verb to make a full sentense.
According to the research of word histories, this phrase was coined by the British statesman Winston Churchill (1874-1965), then First Lord of the Admiralty, in a speech broadcast on the radio on Sunday 1st October 1939, in which he analysed the events of the first month of the Second World War. "I cannot forecast to you the action of Russia. It is a riddle wrapped in mystery inside an enigma, but perhaps there is a key. That key is Russian national interest."
To be quiet or stop making loud noises
Guys, when you do group work, please keep it down to a dull roar.