fair-weather friend

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I had a lot of money and I knew a lot of people, but most of them turned out to be fair-weather friends. CIDI

Watch out for a fair- weather friend or a back stabbing buddy Wednesday and don't be too disappointed or upset if someone you like and admire turns out to be a real rotter with feet of clay.  BNC

I had warned you that Tina was only a fair-weather friend. WebCorp
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