The answer is: Metaphor. It is a metaphor because you are saying that Matthew has the hands of a monkey.
A metaphor compares two objects that are different without like or as. A metaphor would be "the moon is a cookie". Kick him right square does not compare two things, so it would not be a metaphor. It seems more like an idiom, which does not mean what it is saying. For example, the idiom "Kick the bucket" means death, but a new speaker to English cannot tell because it does not mean what it literally says.
opportunities
Another idiom that means the same thing would be "all at sea."
The idiom, at sixes and sevens means that you are in a state of panic, confusion and uncertainty. You could use this idiom in a sentence by saying, she was at sixes and sevens as to whether or not to tell her best friend that her husband was being unfaithful.
I do believe you heard the idiom wrong. It's "apple of one's eyes." See the link below for the meaning.
metaphor
Dozing off ; Being distracted ; Not paying attention
Idiom
No. It is an idiom.
a metaphor
idiom
No it is not. It is more of an idiom.
idiom is like discribe e.g as light as a feather
None. "As _____ as a ______" is a metaphor. The proper metaphor would be "as fresh as a daisy."
metaphor
it's a metaphor because comparing you to a couch potato
It makes perfect sense, so it's not AN idiom.