"It's raining cats and dogs!"
That's an idiom (you can't take it literally)
***MERGE THIS QUESTION*** should be with "What are some examples of idioms" - see Related Question link below
Idioms are expressions that have meanings beyond the literal interpretation of the words used. They are culturally specific and often closely tied to the language and region they come from. Idioms can be colorful, creative, and non-literal.
"On the outs" IS an idiom! Many colorful expressions cover the subject of fallen out lovers, among them Splitsville and Pffft.
Idioms are a part of daily speech. They convey meaning quickly and are often easy to use and learned early on by native speakers. Idioms are also an important part in the process of "acculturation". According to Wikipedia: Acculturation is the exchange of cultural features that results when groups of individuals having different cultures come into continuous first hand contact. Idioms are pivotal in learning a new language. A learner of a second language is informally considered "advanced" when and if he/she masters the use of idioms.
You can find a list of Canadian idioms for free by searching online or checking websites that feature collections of idiomatic expressions. Websites like The Free Dictionary or FluentU may have resources that include Canadian idioms. Additionally, some language learning websites or forums might have discussions on Canadian idioms that you can access for free.
I don't know what an idiom packet is, so no.
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.
You can find lists of idiomatic expressions in dictionaries, language learning websites, and books specifically focused on idioms. Online platforms like Cambridge Dictionary, Oxford Learner's Dictionary, and ESL websites like FluentU and ESL Gold provide extensive lists of idiomatic expressions. Reading books or listening to native speakers can also help you learn idiomatic expressions in context.
Southern Black idioms are unique phrases or expressions that are commonly used in the African American community in the southern United States. These idioms often reflect the cultural heritage, history, and experiences of Black individuals in the region, and may include references to food, music, spirituality, and everyday life. Some examples of Southern Black idioms are "bless your heart," "fixin' to," and "grits and gravy."
Moon Phrases or Idioms (http://dictionary.reference.com/browse/idiom) are phrases that refer to the moon, but use the reference in the way that other words are used in Idiomatic speech. Check this link for some common Moon Idioms and expressions that you may already know. http://home.hiwaay.net/~krcool/Astro/moon/moonwords/index.htm Some other idioms you may know are listed here: http://www.idiomsite.com/
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'.