With these examples, you could replace the ones that have 'like' with 'as' and it will still be a simile, and vice versa. Silent like a fox. Sneaky like a fox. Sly like a fox. As red as a fox. As thin as a fox. As keen as a fox.
As cunning as a fox
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It is a similie as you are comparing (something) to how sly the fox is. A similie uses the words "like or "as".
simile
Someone who is as sly as a fox is cunning, clever, and able to navigate tricky situations with skill and subtlety. They are adept at thinking quickly on their feet and finding creative solutions to challenges.
He had fooled them all as he was as cunning as a fox. They knew he was as cunning as a fox, so they would need a very good plan to win.
Like a happy fox
The phrase "sly as a fox" is a simile because it directly compares Max to a fox using "as." If it were a metaphor, it would say, "Max is a fox."
Since there is no "like" or "as" in the sentence, it is a metaphor.
It is a similie as you are comparing (something) to how sly the fox is. A similie uses the words "like or "as".
simile for stuck
It is not a simile!
Smart as a Fox or Monkey ???
cow, or heifer