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fair-weather friend noun

  /ˈfɛəˌwɛðə ˈfɹɛnd/ , /ˈfɛɚˌwɛðɚ ˈfɹɛnd/ , /ˈfɛːˌwɛðə ˈfɹɛnd/
  • (idiomatic) One who is friendly, helpful, or available only when it is advantageous or convenient to be so. [from early 18th c.]
 Schönwetterfreund
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