A humble expression for being unwell or indisposed, indicating one is too fatigued or ill to perform duties, traditionally referring to the worry of someone too sick to carry firewood.
他今日身体不适，有负薪之忧，恐不能出席晚上的会议了。
He is feeling unwell today, suffering from a 'worry of carrying firewood', and likely won't be able to attend the evening meeting.
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