Native speakers of any language use quite a lot of idiomatic expressions without thinking.
However, when you are learning a foreign language it is one of many stumbling blocks.
Let's sort them out!

Off the hook - to free smb from an obligationTo make a mountain out of the molehill - to make a big issue out of a small issueBarefaced - being deliberately bold and shameless- to lie without any embarrassmentTo pull smth out of the hat - To produce smth unexpectedly - by surprise - and solve a problem- to imagine things that are not trueIn the blink of an eye - Very fast