Final answer:
The phrase 'Love is blind and deaf' is a metaphor and can also be considered an idiom, as it makes a direct comparison between love and the state of being unable to see or hear without using 'like' or 'as'.
Step-by-step explanation:
The phrase 'Love is blind and deaf' is an example of a metaphor. A metaphor is a figure of speech that makes a direct comparison between two unlike things without using 'like' or 'as'. In this case, the metaphor suggests that love is not influenced by the physical appearance or flaws of the person loved, as if having no ability to see or hear those flaws. It is different from a simile, which would use 'like' or 'as' to make the comparison; for example, 'love is like a fog that blinds and deafens'. Moreover, this metaphorical statement can be considered an idiom, which is a commonly used expression whose meaning does not relate to the literal meaning of its words.