Respuesta :
Answer:
A group of words established by usage as having a meaning not deducible from those of the individual words
OR
A characteristic mode of expression in music or art.
Answer:
Idiom is an expression whose meaning is different from the meaning of its individual words for example:
Piece of cake:
The meaning of this isn't self explanatory (literal) because the words aren't at all connected to the meaning. The meaning of this often used term means easy or simple.