A: Where is Peter? I haven't seen him for quite a few days.
B: He's on his back now.
A: I am sorry to hear that. But he was all right last week.
B: Yeah, he was caught in the rain the other day. He had got a very bad cold.
on one's back
Be on one's back的意思是“生病卧床不起”的意思。
E.g. He caught a bad cold and was on his back for a week.
E.g. Please give a call to our manager and tell him that I am sick and on my back.
be caught in the rain：淋雨
E.g. He was wringing wet because he was caught in the rain without an umbrella.
E.g. He has been caught in the rain and is wet through and through.
E.g. I was caught in the rain on my way home. As a result I had a bad cold.
the other day：不久前某一天
She looked at the vendor who cheated her the other day with distaste.
I chanced to see our old headmaster in the street the other day.
get a bad cold：严重感冒
E.g. I get a bad cold; therefore, I can't attend the meeting.
E.g. I have got a bad cold, running at the nose.
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