Poison (one) against (someone or something) phrase
To make someone think bad things about someone/something.
With a view to poisoning my friends against me, he invented a false story showing how untrusty I was.
The gossip that I cheated on my girlfriend has poisoned all girls in my class against me.
They keep avoiding me like the plague. Someone must have poisoned them against me.
The verb "poison" must be conjugated according to its tense.
The origin of this phrase is not clear.
Being perfectly suitable for one's interests or abilities
Jasmine really loves children, so being a kindergarten teacher would be right up her alley.