toil over (someone or something)
1. To work continually, diligently, and strenuously to complete something. I've been toiling over this project for weeks now, and it still feels like it's never going to be done.
2. Of a surgeon, to spend long, continuous hours operating on a patient. Our team toiled over him for nearly six hours, but in the end we weren't able to save his life. I'm so sorry.
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