Learn English – Idiom similar to wolf in sheeps clothing

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I’m writing lyrics for a song about xenophobia and have a line that I like
“Just because there has been one wolf in wool, doesn’t mean we all have fangs”
I’d like to follow that up with another deconstructed idiom like that but I hit a wall. Any ideas? Thanks!

Best Answer

The idiom "snake in the grass" may work well for you.

This idiom continues the theme of animals hiding and waiting to attack. However, snakes are terribly misunderstood and virtually none intend to harm humans (in fact numerically few are even capable of harming a creature as large as a human.) Despite this, snakes are vilified as incredibly destructive; so much so that the idiom in question implies that if a person were to walk in tall grass where a snake was located, then something terrible would happen to that person.