Meaning of “ハートは赤く染まる”


What does ハートは赤く染まる mean? It’s from a love song about someone being completely
smitten by another.

I know the literal translation is “(my) heart is stained red” but what is the
meaning of this phrase?




> 「ハートは赤{あか}く染{そ}まる」

Unless the context proves otherwise, it should mean something along the lines
of:

> "My heart turns red."

or

> "My heart flushes."

To me, "stain" would sound quite strange.

