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what's eating?
What's eating someone?
Inf. Fig. What is bothering someone? Tom: Go away! Bob: Gee, Tom, what's eating you? Bill: Tom's so grouchy lately. What's eating him? Bob: Beats me!
what's eating somebody?
(informal) something that you ask when someone is angry and you want to know why He suddenly noticed I wasn't joining in the conversation. 'What's eating you tonight?' he asked.