Have it in for somebody
Definition 1 of 1
Pro Tip 1/3Negative Emotion
It suggests a strong dislike, not just a mild annoyance or typical disagreement. 
She has had it in for me ever since I got the promotion she wanted.
Pro Tip 2/3Subtle Intention
The phrase implies a covert plan or intent to harm, not necessarily through direct confrontations. 
After the prank I played on him, I'm sure he has it in for me now.
Pro Tip 3/3Long-term Hostility
It can imply a long-standing resentment that might not easily be resolved. 
Mia has had it in for her co-worker for years, blaming her for a missed promotion.
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