To "burn the midnight oil" means to:


If someone is "barking up the wrong tree," they are:


What does "piece of cake" refer to?


To "let the cat out of the bag" means to:


If someone is "on cloud nine," they are:


What does "spill the beans" mean?


To "hit the nail on the head" means to:


Choose the correct meaning of the idiom 'break the ice'.


What does the idiom 'under the weather' mean?


Which of the following idioms means 'to reveal a secret'?