Here's why:
* Definition: A mannerism is a distinctive or characteristic way of speaking, behaving, or moving.
* Usage: You can use "mannerism" as the subject of a sentence: *Her nervous mannerism was tapping her foot.*
* Other parts of speech: While "mannerism" itself is a noun, you might encounter related words like:
* Mannerly (adjective) - polite
* Mannered (adjective) - artificial or affected in behavior
* Manner (noun) - a way of acting or behaving