A student of mine was telling me just how hectic his day had been. He left home early in the morning and spent a few hours driving around meeting clients. Then, the afternoon was taken up with Zoom meetings and video calls. At the end of the work day, he had shopping to do. By the time he got home, he was already on his last legs. At this point, he decided that the only energy he had left was to put a frozen pizza in the oven and have this for dinner while lying on the sofa watching telly.
Who can blame him? When you are on your last legs, you’re too tired to do anything. The only thought you have is of going to bed and sleeping the busy day away.
[to be on your last legs => exhausted , extremely tired]

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