What is an idiom. please help​

idiom noun

id·​i·​om | \ ˈi-dē-əm

Definition of idiom

1 : an expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements (such as up in the air for "undecided") or in its grammatically atypical use of words (such as give way)

2a : the language peculiar to a people or to a district, community, or class : dialect

b : the syntactical, grammatical, or structural form peculiar to a language

3 : a style or form of artistic expression that is characteristic of an individual, a period or movement, or a medium or instrument the modern jazz idiom broadly : manner, style a new culinary idiom

i dont know look it up

Explanation:

im just trying to get coins or whatver you call them

the answer is:  

she is proud of her daughter and her game skills.  

explanation:  

the author’s mother sat proudly on the bench telling her admirers   with humility that her skills were luck, waverly's mother felt felt very proud about her and she wanted to intriduce her daughter to everyone they met.