colloquialism
US /kəˈloʊ.kwi.ə.lɪ.zəm/
UK /kəˈloʊ.kwi.ə.lɪ.zəm/
1.
a word or phrase that is not formal or literary and is used in ordinary or familiar conversation
:
•
Using 'gonna' instead of 'going to' is a common colloquialism.
•
The book was full of regional colloquialisms that made it hard for outsiders to understand.