“Atticus had promised me he would wear me out if he ever heard of me fighting anymore; I was far too old and too big for such childish things, and the sooner I learned to hold in, the better off everybody would be.”
Answer:
Idiom
Explanation:
As nouns the difference between idiom and euphemism is that idiom is a manner of speaking, a way of expressing oneself while euphemism is (uncountable) the use of a word or phrase to replace another with one that is considered less offensive, blunt or vulgar than the word or phrase it replaces.
Example:
Instead of using
You're just a *****
you would use
You're just a scaredy-cat.
That would be a euphemism
The metaphor in the passage is line 2
