monkey on (one's) back
1. slang A drug addiction. Did you hear? Pete checked himself into rehab to deal with the monkey on his back. I've been clean and sober for nearly five years, but I can still feel the monkey on my back breathing down my neck.
2. A persistent burden or problem. This project is such a monkey on my back right now—I can't wait for it to be over. Trust me, don't get in debt. You don't want that monkey on your back.
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