It’s a metaphor because it describes something that doesn’t exist
Answer:
Depedning on the part of speech (adj.) and (verb.) it can have different synonyms. For it's verb form some synonyms vary from: fuse, merge, make similar, unite and combine. Basically anything that has to do with the milk substance coming together with the cream. Hope this helps :)
Answer:
I mean, I don't know about you, but they probably don't use them for whistling.
Explanation:
I am 100% sure about this. But what an odd question.
Hope this helps! :D