CapriUni

Wracking my brain for a few minutes. I think I have created an example for you.

Her cheeks were rosy
Her tears the dew.

It is not saying that her cheeks are roses til the second line. but saying that her cheeks are the colour of roses sets that up. There is no metaphor til the second line when it then becomes a double metaphor because the second metaphor cannot stand on its own.