The most common idiom about cats is "Curiosity killed the cat."
A cat has nine lives.
It's raining cats and dogs.
There are many idioms and phrases for 'on the back burner'. Some idioms and phrases for 'on the back burner' include 'pushing aside' and 'procrastinating'.
Idioms can be confusing because they often have meanings that are different from the literal meanings of the words they contain. Additionally, idioms can vary between languages and cultures, making them challenging for non-native speakers to understand. Lastly, idioms are deeply ingrained in a language's use, so learning them requires familiarity and practice.
"Idioms for Being Afraid", "Idioms for Being Angry", "Idioms for Being Happy" are some examples of idioms found in the book "Found" by Margaret Peterson Haddix.
Here is a link to some idioms. You can pick the "non-common" ones for yourself -- some people have heard certain idioms a lot and others have not heard the same ones, so you'll need to decide that part.
Some websites that have idioms written in them include The Free Dictionary, Cambridge Dictionary, and Phrases.com. These sites provide definitions and examples of idioms to help users understand their meanings and usage in context.
savvy, brainy
Each of those idioms is already a sentence.
The best place is to go on your search engine and type in "list idioms" You can also look at this question for some examples.
Nostalogic
cry unclemonkey's uncle
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