An idiom is a group of words that don't really hold a meaning. Some examples:
“You’re full of baloney.” - as tasty as it is, it’s made with the scraps or has little value.
“Once in a blue moon” - very rare
“Beat around the bush” - to avoid the main topic.
"Don't judge a book by its cover."
“Break a leg” - to wish someone luck.
“Blow someone away” - to be impressed.
“Black sheep” - the outcast.
“The cat would eat fish but not wet her feet.” - the stress to take risks
“Fish out of water” - someone in a new situation.
“Head in the clouds” - thinking unpractical thoughts
“Haven’t the foggiest idea.” - to not know something at all.
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